问题 解答题

解方程.

x+1.7=9.2

0.36-2x=0.12

x÷0.25=4

8x=6.4.

答案

(1)x+1.7=9.2,

x+1.7-1.7=9.2-1.7,

x=7.5;

(2)0.36-2x=0.12,

0.36-2x+2x=0.12+2x,

0.12+2x=0.36,

0.12+2x-0.12=0.36-0.12,

2x=0.24;

2x÷2=0.24÷2;

x=0.12;

(3)x÷0.25=4,

x÷0.25×0.25=4×0.25,

x=1;

(4)8x=6.4,

8x÷8=6.4÷8,

x=0.8.

单项选择题
单项选择题