作业帮x-2y=15,xy=-25,求x*x+4y*y-1
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x-2y=15,xy=-25,求x*x+4y*y-1
x-2y=15,xy=-25,求x*x+4y*y-1
x-2y=15,xy=-25,求x*x+4y*y-1
那位筒子计算错了
xy=-25
x^2+4y^2+100=225
x^2+4y^2=125
→x^2+4y^2-1=124
x^2表示x的平方
(x-2y)^2=x^2+4y^2-4xy=225
则x^2+4y^2=225-4xy=225+100=325
所以原式=325-1=324
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