若4X-3y-6z=0 x=2y-7z=0(x*y*z≠0) 求代数式 5x*5x+2y*2y-6z*6z/2x*2x-
3个回答
4x-3y-6y=0
x+2y-7z=0
可得:x=3z,y=2z.
代入分式中可得:其值为-41/20
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