yi dao pu tong shu xue ti
来源:百度知道 编辑:UC知道 时间:2024/05/29 13:00:08
a-b=10 ab=7 求a=? b=?
a1=5+4*2^0.5,b1=-5+4*2^0.5
a2=5-4*2^0.5,b2=-5-4*2^0.5;
根据第二个式子 a=7/b(显然b不等于0,否则ab=0)
将上式带入第一个式子得 7/b-b=10解出b=2或5,对应的a为7/2或7/5.
Idon'~~know
bei yi ge ren xi huan ye tong ku ma ?
tong~~~~~~
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