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(7.5+x)*(7.5+x)=100
2012/6/12后的回答无效.
人气:158 ℃ 时间:2020-08-19 18:34:59
解答
(7.5+x)*(7.5+x)=100;
7.5+x=10或7.5+x=-10;
x=2.5或x=-17.5;
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