问题
解答题
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答案
(1)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(2)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;
(3)5.4-2X=3.6,
5.4-2X+2X=3.6+2X,
3.6+2X=5.4,
3.6+2X-3.6=5.4-3.6,
2X=1.8,
2X÷2=1.8÷2,
X=0.9;
(4)7X+5×0.7=8.4,
7X+3.5=8.4,
7X+3.5-3.5=8.4-3.5,
7X=4.9,
7X÷7=4.9÷7,
X=0.7.