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

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