1.15x^2n+7x^ny^n+1-4y^2n+2

jfdgdf2022-10-04 11:39:542条回答

1.15x^2n+7x^ny^n+1-4y^2n+2
2.(x^2+3x)^2-22(x^2+3x)+72
3.4x^4y^2-5x^2 y^2-9y^2

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44n44n 共回答了12个问题 | 采纳率75%: 1.15x^2n+7x^ny^n+1-4y^2n+2
=[3x^n-y^(n+1)][5x^n+4y^(n+1)]
2.(x^2+3x)^2-22(x^2+3x)+72
=(x^2+3x-4)(x^2+3x-18)
=(x-1)(x+4)(x+6)(x-3)
3.4x^4y^2-5x^2 y^2-9y^4
=(4x^2-9y^2)(x^2+y^2)
=(2x+3y)(2x-3y)(x^2+y^2); 1年前

薄荷红茶1985 共回答了1099个问题 | 采纳率: 15＝3×5,4=-1×4
15x^2n+7x^ny^n+1-4y^2n+2=(3x^n-y^(n+1))(5x^n+4y^(n+1))
72=-4×(-18),22=-4+(-18)
(x^2+3x)^2-22(x^2+3x)+72=(x²+3x-4)(x²+3x-18)=(x-1)(x+4)(x+6)(x-3)
4x^4y^2-5x^2 y^2-9y^2
=(4x^4-5x^2-9)y^2
=(4x^2-9)(x²+1)y²
=(2x-3)(2x+3)(x²+1)y²; 1年前

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