问题 解答题
3.2x-4×3=52x:1.2=3:45.4-2X=3.67X+5×0.7=8.4.
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.

写作题
单项选择题