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解方程.x-65%x=7025%+10x=45(x+2.6)÷70%=8

题目详情
解方程.
x-65%x=70 25%+10x=
4
5
(x+2.6)÷70%=8
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答案和解析
(1)x-65%x=70
                 0.35x=70
        0.35x÷0.35=70÷0.35
                      x=200;

(2)25%+10x=
4
5

        0.25+10x=0.8
0.25+10x-0.25=0.8-0.25
                10x=0.55
          10x÷10=0.55÷10
                   x=0.055;

(3)(x+2.6)÷70%=8
(x+2.6)÷70%×70%=8×70%
                       x+2.6=5.6
                 x+2.6-2.6=5.6-2.6
                             x=3.