题目内容
| 解方程. 13.5-3x=1.5×3 | (x+5.2)÷2.5=3 | 18÷(2x)=36. |
(1)13.5-3x=1.5×3,
13.5-3x+3x=4.5+3x,
13.5-4.5=4.5+3x-4.5,
3x÷3=9÷3,
x=3;
(2)(x+5.2)÷2.5=3,
(x+5.2)÷2.5×2.5=3×2.5,
x+5.2-5.2=7.5-5.2,
x=2.3;
(3)18÷(2x)=36,
18÷(2x)×2x=36×2x,
18=72x,
72x÷72=18÷72,
x=0.25.
13.5-3x+3x=4.5+3x,
13.5-4.5=4.5+3x-4.5,
3x÷3=9÷3,
x=3;
(2)(x+5.2)÷2.5=3,
(x+5.2)÷2.5×2.5=3×2.5,
x+5.2-5.2=7.5-5.2,
x=2.3;
(3)18÷(2x)=36,
18÷(2x)×2x=36×2x,
18=72x,
72x÷72=18÷72,
x=0.25.
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