# 2019 June(72F) Math Question 1

**Choice E**

$$\frac{4}{y}=0.4$$
$$\Rightarrow \frac{4}{y}\times y=0.4\times y$$
$$\Rightarrow 4=0.4y$$
$$\Rightarrow y=10$$

# 2019 June(72F) Math Question 2

**Choice J**

$$60\times1.24=74.4$$

# 2019 June(72F) Math Question 3

**Choice C**

$$$10\times40+$10\times(1\frac{1}{2})\times7$$
$$=$400+$105$$
$$=$505$$

# 2019 June(72F) Math Question 4

**Choice J**

$$3x^{9}\cdot 5x^{9}$$
$$=3\times5\times x^{9+9}$$
$$=15x^{18}$$

# 2019 June(72F) Math Question 5

**Choice B**

$$T=\pi r^{2}+\pi rs$$
$$T=\pi 3^{2}+\pi \times3\times5$$
$$=9\pi+15\pi$$
$$=24\pi$$

# 2019 June(72F) Math Question 6

**Choice K**

$$180°-45°-65°=70°$$

# 2019 June(72F) Math Question 7

**Choice B**

$$35=5\cdot7$$
$$28=2\cdot2\cdot7$$
$$8=2\cdot2\cdot2$$
$$2\cdot2\cdot2\cdot5\cdot7=280$$

# 2019 June(72F) Math Question 8

$$x=-2,5$$
$$f(x)=(x-5)(x+2)^{2}$$
$$f(-2)=0$$
$$f(5)=0$$

# 2019 June(72F) Math Question 9

**Choice F**

$$60\div(3+5+7)=60\div15=4$$
$$4\times7=28$$

# 2019 June(72F) Math Question 10

**Choice F**

$$f(9)=6$$
$$f(12)=8$$
$$F.\ f(x)=\frac{2}{3}n$$
$$f(9)=\frac{2}{3}\times9=6$$
$$f(12)=\frac{2}{3}\times12=8$$

# 2019 June(72F) Math Question 11

**Choice C**

$$(\frac{2+8}{2}，\frac{5+11}{2})=(5，8)$$

# 2019 June(72F) Math Question 12

**Choice F**

$$1\times1\times\frac{1}{9}=\frac{1}{9}$$

# 2019 June(72F) Math Question 13

**Choice C**

$$=3x^{2}+x^{2}-4x-6x-5-7$$
$$=4x^{2}-10x-12$$

# 2019 June(72F) Math Question 14

**Choice H**

22 is even.

22 is not prime.

# 2019 June(72F) Math Question 15

**Choice C**

$$=\mid-42+32\mid=\mid-10\mid=10$$

# 2019 June(72F) Math Question 16

**Choice G**

$$11x+6y=3$$
$$y=\frac{-11}{6}x+3$$

# 2019 June(72F) Math Question 17

**Choice A**

$$g(2,4,3)$$
$$=4\times2\times4-3\times2\times (-3)^{2}$$
$$=32-54=-22$$

# 2019 June(72F) Math Question 18

**Choice H**

$$x°:360°=5000:45000$$
$$\Rightarrow x=40°$$

# 2019 June(72F) Math Question 19

**Choice A**

$$4000\div5=800$$

# 2019 June(72F) Math Question 20

$$3000:9000=1:3=\frac{1}{3}$$

# 2019 June(72F) Math Question 21

**Choice E**

$$4000+9000+5000+3000=21000 …

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# 2019 June(72F) Math Question 22

$$(2x-10)+y=180 \Rightarrow 2x …

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# 2019 June(72F) Math Question 23

**Choice D**

$$7-2=5$$
$$9-4=5$$
$$8-0 …

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# 2019 June(72F) Math Question 24

**Choice G**

$$\tan C=\frac{8}{15}$$

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# 2019 June(72F) Math Question 25

**Choice B**

$$3a-5b=22---(1)$$
$$a+3b …

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# 2019 June(72F) Math Question 26

**Choice F**

$$3r+4p+50=545$$
$$\Rightarrow …

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# 2019 June(72F) Math Question 27

**Choice C**

$$1st\ rectangle:\ 1\times2+4 …

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# 2019 June(72F) Math Question 28

**Choice F**

$$2x^{3}+x^{2}-6x …

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# 2019 June(72F) Math Question 29

**Choice E**

$$P(Not\ blue)$$
$$=1-P(Blue …

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# 2019 June(72F) Math Question 30

**Choice J**

$$3x+1=5x-9$$
$$\Rightarrow 2x …

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# 2019 June(72F) Math Question 31

**Choice C**

$$\cos L=\frac{a}{c …

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# 2019 June(72F) Math Question 32

**Choice K**

$$(3.5+0.25n)(2500-100n)$$

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# 2019 June(72F) Math Question 33

**Choice B**

$$2\pi r=20$$
$$r …

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# 2019 June(72F) Math Question 34

**Choice K**

$$30°:60°:90°$$
$$\Rightarrow 1 …

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# 2019 June(72F) Math Question 35

**Choice C**

$$45°:45°:90°$$
$$\Rightarrow 1 …

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# 2019 June(72F) Math Question 36

**Choice G**

$$1\times4=4$$

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# 2019 June(72F) Math Question 37

**Choice D**

$$450°=90°\times5$$

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# 2019 June(72F) Math Question 38

**Choice J**

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# 2019 June(72F) Math Question 39

**Choice C**

$$\sqrt[3]{3x-9}+10=13 …

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# 2019 June(72F) Math Question 40

**Choice J**

$$=$2000(1+\frac{0.06 …

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# 2019 June(72F) Math Question 41

**Choice A**

$$2\div7$$
$$=0.285714285714...$$
$$=0 …

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# 2019 June(72F) Math Question 42

**Choice K**

$$\frac{60+65+70+75 …

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# 2019 June(72F) Math Question 43

$$P=\frac{64G}{S}$$
$$\Rightarrow …

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# 2019 June(72F) Math Question 44

**Choice K**

x quarters,

x+5 dimes …

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# 2019 June(72F) Math Question 45

$$(3,9)\rightarrow(1,3 …

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# 2019 June(72F) Math Question 46

**Choice F**

$$5^{2}+8^{2}=x …

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# 2019 June(72F) Math Question 47

**Choice E**

$$x-20 \Rightarrow x+20$$
$$(x …

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# 2019 June(72F) Math Question 48

**Choice F**

The range of temperatures is …

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# 2019 June(72F) Math Question 49

**Choice A**

$$x+3=0$$
$$\Rightarrow x …

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# 2019 June(72F) Math Question 50

**Choice G**

$$Circle\ area=\pi r^{2 …

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# 2019 June(72F) Math Question 51

**Choice D**

$$\frac{3^{x}3^{4 …

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# 2019 June(72F) Math Question 52

**Choice J**

All real numbers except 7.

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# 2019 June(72F) Math Question 53

**Choice D**

By the Law of Sines …

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# 2019 June(72F) Math Question 54

**Choice G**

$$F.\ f(x) > 0 \Rightarrow …

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# 2019 June(72F) Math Question 55

**Choice D**

To minimize 2/(y-x),

we …

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# 2019 June(72F) Math Question 56

**Choice F**

$$\Rightarrow (-r,s)$$

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# 2019 June(72F) Math Question 57

**Choice E**

$$=\begin{bmatrix}2 & -5 \\-3 …

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# 2019 June(72F) Math Question 58

**Choice G**

$$\overline{AE}=\overline{BE}$$
$$\overline …

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# 2019 June(72F) Math Question 59

**Choice D**

$$ab\gt 0,$$
$$(-)(-)\gt 0 …

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# 2019 June(72F) Math Question 60

**Choice G**

B is between D and …

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