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10

解:4.8x-2.4 = 1.2

4.8x-2.4+2.4 = 1.2+2.4

4.8x = 3.6

4.8x÷4.8 = 3.6÷4.8

x = 0.75

2

$ \begin{aligned}解:4.5x &= 9 \\ 4.5x÷4.5 &= 9÷4.5 \\ x &= 2 \\ \end{aligned}$

$ 解:設(shè)第二小學(xué)男生有x人。\ $

$1.2x?x=760?640\ $

$0.2x=120$

$x=600$

$答：第二小學(xué)男生有600人。$

解:8x+3.6 = 30

8x+3.6-3.6 = 30-3.6

8x = 26.4

8x÷8 = 26.4÷8

x = 3.3

40

$ \begin{aligned} 解：x-5&=12 \\ x-5+5&=12+5 \\ x&=17 \\ \end{aligned}$

$ 解:設(shè)原兩位數(shù)十位上的數(shù)字是x，則個(gè)位上$

$ 的數(shù)字是2x。\ $

$(2x×10+x)?(10x+2x)=36\ $

$解得：x=4\ $

$2x=2×4=8\ $

$答：原兩位數(shù)是48。$

B

C

$ \begin{aligned} (x+6.7)×3÷2&=18 \\ 解：x+6.7&=12 \\ x+6.7-6.7&=12-6.7 \\ x&=5.3 \\ \end{aligned}$

$ \begin{aligned} 24.2×3+5x&=84.6 \\ 解：72.6+5x&=84.6 \\ 5x&=12 \\ x&=2.4 \\ \end{aligned}$

10

2