x^2-xy-6y^2+3xy+y+2
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x^2-xy-6y^2+3xy+y+2x^2-xy-6y^2+3xy+y+2x^2-xy-6y^2+3xy+y+23xy是3x原式=(x-3y)(x+2y)+3x+y+2十字相乘x-3y2×x+2y1
x^2-xy-6y^2+3xy+y+2
x^2-xy-6y^2+3xy+y+2
x^2-xy-6y^2+3xy+y+2
3xy是3x
原式=(x-3y)(x+2y)+3x+y+2
十字相乘
x-3y 2
×
x+2y 1
所以原式=(x-3y+2)(x+2y+1)
1/(x+1)-x(x+1)(x-1)=0
两边乘(x+1)(x-1)
(x-1)-x=0
-1=0
不成立
方程无解
两边乘x(x-7)
100(x-7)=30x
100x-700=30x
70x=700
x=10
经检验，x=10是方程的解
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