问题 解答题
解方程
①10x+2x=36
②1.8x+7×0.9=8.64
③9x-3×12=18④1.2×(x+2.4)=6.
答案

(1)10x+2x=36,

12x=36,

12x÷12=36÷12,

x=3;

(2)1.8x+7×0.9=8.6,

1.8x+6.3-6.3=8.6-6.3,

1.8x÷1.8=2.3÷1.8,

x=1

5
18

(3)9x-3×12=18,

9x-36+36=18+36,

9x÷9=54÷9,

x=6;

(4)1.2×(x+2.4)=6,

1.2×(x+2.4)÷1.2=6÷1.2,

x+2.4-2.4=5-2.4,

x=2.6.

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