分解因式x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22一共有五题x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22
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分解因式x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22一共有五题x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22
分解因式x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22
一共有五题x^2-10x-11
x^2y^2-16xy+60
(x+y)^2-7(x+y)-18
x^2-13xy-30y^2
(a+b)^2+9(a+b)-22
分解因式x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22一共有五题x^2-10x-11 x^2y^2-16xy+60 (x+y)^2-7(x+y)-18 x^2-13xy-30y^2 (a+b)^2+9(a+b)-22
x^2-10x-11 =(x-10)(x+1)
x^2y^2-16xy+60 =(xy-10)(xy-6)
(x+y)^2-7(x+y)-18 =(x+y-9)(x+y+2)
x^2-13xy-30y^2 =(x-15y)(x+2y)
(a+b)^2+9(a+b)-22 =(a+b+11)(a+b-2)
都可以用十字相乘分解
有题意得
1.(x-11)(x+1)
2.(x+y-9)(x+y+2)
3.(x-15y)(x+2y)
4.(a+b+11)(a+b-2)
1.(x-11)(x+1)
2.(x+y-9)(x+y+2)
3.(x-15y)(x+2y)
4.(a+b+11)(a+b-2)