10/100-X=12%10/(100-x)=12%

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10/100-X=12%10/(100-x)=12%10/100-X=12%10/(100-x)=12%10/100-X=12%10/(100-x)=12%可以把题转换成0.1-X=0.12解得X=-

10/100-X=12%10/(100-x)=12%
10/100-X=12%
10/(100-x)=12%

10/100-X=12%10/(100-x)=12%
可以把题转换成 0.1-X=0.12
解得 X=-0.02

0.1-x=0.12;解的x=-0.02;