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一3x^2-xy-10y二x^4-2x^2-8三x^2-y^2-x-y
题目详情
一3x^2-xy-10y 二x^4-2x^2-8 三x^2-y^2-x-y
▼优质解答
答案和解析
都是十字相乘法
3x^2-xy-10y
=(x)(3x)-xy-(2y)(5y)
=(x-2y)(3x+5y)
x^4-2x^2-8
=(x^2)^2 - 2*(x^2) - 8
=(x^2 -4)(x^2+2)
=(x+2)(x-2)(x^2+2)
x^2-y^2-x-y
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
3x^2-xy-10y
=(x)(3x)-xy-(2y)(5y)
=(x-2y)(3x+5y)
x^4-2x^2-8
=(x^2)^2 - 2*(x^2) - 8
=(x^2 -4)(x^2+2)
=(x+2)(x-2)(x^2+2)
x^2-y^2-x-y
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
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