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求解题目十字相乘法分解因式1.a^3-5a^2-6a=2.y^2-8y+7=3.x^2*y^2-6xy-7=4.36-5(a+b)-(a+b)^2=5.x^2-(a-b)x-ab=6.4a^2-5a-6=7.x^2+6x+8+8.3a^2-8a+4=9.3a^2-8a+4=10.x^3-4x^2-21x11.x^2y+10xy+25y=12.x^4+10x^2-11=13.x^4-13x^2y^2+36y^414.(x

题目详情
求解题目十字相乘法分解因式
1.a^3-5a^2-6a= 2.y^2-8y+7= 3.x^2*y^2-6xy-7= 4.36-5(a+b)-(a+b)^2= 5.x^2-(a-b)x-ab= 6.4a^2-5a-6= 7.x^2+6x+8+ 8.3a^2-8a+4= 9.3a^2-8a+4= 10.x^3-4x^2-21x 11.x^2y+10xy+25y= 12.x^4+10x^2-11= 13.x^4-13x^2y^2+36y^4 14.(x-y)^2-3(X-y)-10= 15.x^n+1-3x^n+2x^n+2=
▼优质解答
答案和解析
1:a(a-6)(a+1)
2:(y-7)(y-1)
3:(xy-7)(xy+1)
4:(a+b-1)(a+b+6)
5:(x-a)(x+b)
6:(2a-6)(2a+1)
7:(x+2)(x+4)
8:(3a-2)(a-2)
9:(3a-2)(a-2)
10:x(x-7)(x+4)
11:y(x+5)^2
12:(x^2+11)(x^2-1)
13:(x^2+6y^2)^2
14:(x-y-5)(x-y+2)
15:原式=x^n·x-3x^n+2x^n·2x^2=x^n(4x^2+x-3)=x^n(4x-3)(x+1)
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