问题
解答题
解方程.
x-0.25=0.25
x-0.8x=22
50%x-0.1=0.1
0.2x-0.2×0.7=2.
答案
(1)x-0.25=0.25
x-0.25+0.25=0.25+0.25
x=0.5
(2)x-0.8x=22
0.2x=22
0.2x÷0.2=22÷0.2
x=110
(3)50%x-0.1=0.1
0.5x-0.1+0.1=0.1+0.1
0.5x=0.2
0.5x÷0.5=0.2÷0.5
x=0.4
(4)0.2x-0.2×0.7=2
0.2x-0.14=2
0.2x-0.14+0.14=2+0.14
0.2x=2.14
0.2x÷0.2=2.14÷0.2
x=10.7