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(48-y)^2+4y(2y-48)=0如何解2y^2-2(x+z)y+2xz如何解得2（y-x）(y-z)
题目详情
(48-y)^2+4y(2y-48)=0如何解
2y^2-2(x+z)y+2xz如何解得2（y-x）(y-z)
2y^2-2(x+z)y+2xz如何解得2（y-x）(y-z)
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答案和解析
(48-y)^2+4y(2y-48)=048²-96y+y²+8y²-2*96y=09y²-3*96y+48²=0y²-32y+256=0y²-2*16y+16²=0(y-16)²=0y=162（y-x）(y-z)=2(y²-xy-yz+xz)2y^2-2(x+z)y+2xz=2[y²...
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