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.