问题 解答题

笔算

6x+8=32

2.5×12+3x=36

3.4x+7.6x=35.2

7.2×0.98+2.8×0.98

(50-40×1.2)÷0.5.

答案

(1)6x+8=32,

6x+8-8=32-8,

6x=24,

6x÷6=24÷6,

x=4;

(2)2.5×12+3x=36,

30+3x=36,

30-30+3x=36-30,

3x=6,

3x÷3=6÷3,

x=2;

(3)3.4x+7.6x=35.2,

11x=35.2,

11x÷11=35.2÷11,

x=3.2;

(4)7.2×0.98+2.8×0.98,

=(7.2+2.8)×0.98,

=10×0.98,

=9.8;

(5)(50-40×1.2)÷0.5,

=(50-48)÷0.5,

=2÷0.5,

=4.

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