4x²+2x-9y²+3y,x²+6y-y²-9,x²-xy-2y

雪碧82022-10-04 11:39:541条回答

4x²+2x-9y²+3y,x²+6y-y²-9,x²-xy-2y²-x-y,x²-y²-x-y
2m(a-c)-5(c-a) ,3a(x-y)²-2(y-x)²

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jason7959 共回答了22个问题 | 采纳率90.9%: 4x²+2x-9y²+3y
=(4x²-9y²)+(2x+3y)
=(2x+3y)(2x-3y)+(2x+3y)
=(2x+3y)(2x-3y+1)
x²+6y-y²-9
=x²-(y-3)²
=(x+y-3)(x-y+3)
x²-xy-2y²-x-y,
=(x+y)(x-2y)-(x+y)
=(x+y)(x-2y-1)
x²-y²-x-y
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
2m(a-c)-5(c-a)
=2m(a-c)+5(a-c)
=(a-c)(2m+5)
3a(x-y)²-2(y-x)²
=3a(x-y)²-2(x-y)²
=(3a-2)(x-y)²; 1年前