数学问题,要步骤!!分解因式求高人!!!!!
(3x-4y)(5x-6y)-(7x-8y)乘以(6y-5x)2.6²(x-2)+8(2-x)3.2a+4a²b+24.a(a-b)²-b(...
(3x-4y)(5x-6y)-(7x-8y)乘以(6y-5x) 2. 6²(x-2)+8(2-x) 3.2a+4a²b+2 4.a(a-b)²-b(b-a) 5.-6(x-y)³+18(y-x)²-24(y-x)³ 6. -5x²+10xy-25xy² 7.a(a-b)+(a-b)²
8.-a²b+5ab 9. 3a²b-6ab+9b 展开
8.-a²b+5ab 9. 3a²b-6ab+9b 展开
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【参考答案】
(3x-4y)(5x-6y)-(7x-8y)(6y-5x)
=15x^2 -18xy-20xy+24y^2-(42xy-35x^2 -48y^2 +40xy)
=15x^2 -38xy+24y^2 -82xy+35x^2 +48y^2
=50x^2 -120xy+72y^2
=2(25x^2 -60xy+36y^2)
=2(5x-6y)^2
(6^2)(x-2)+8(2-x)
=36(x-2)-8(x-2)
=28(x-2)
2a+4(a^2)b+2
=2a(1+2ab)+2
a(a-b)^2 -b(b-a)
=(b-a)[a(b-a)-b]
=(b-a)(-a^2 +ab-b)
-6(x-y)^3 +18(y-x)^2 -24(y-x) ^3
= 6(y-x)^2 [(y-x)+3-4(y-x)]
=6(y-x)^2 (3x-3y+3)
=18(x-y+1)(x-y)^2
-5x^2 +10xy-25xy^2
=-5x(x-2y+5y^2)
a(a-b)+(a-b)^2
=(a-b)[a+(a-b)]
=(a-b)(2a-b)
-a^2 b+5ab
=-a(ab-5b)
3a^2 b-6ab+9b
=3(a^2 -2ab+3b)
满意敬请采纳,不理解欢迎追问
(3x-4y)(5x-6y)-(7x-8y)(6y-5x)
=15x^2 -18xy-20xy+24y^2-(42xy-35x^2 -48y^2 +40xy)
=15x^2 -38xy+24y^2 -82xy+35x^2 +48y^2
=50x^2 -120xy+72y^2
=2(25x^2 -60xy+36y^2)
=2(5x-6y)^2
(6^2)(x-2)+8(2-x)
=36(x-2)-8(x-2)
=28(x-2)
2a+4(a^2)b+2
=2a(1+2ab)+2
a(a-b)^2 -b(b-a)
=(b-a)[a(b-a)-b]
=(b-a)(-a^2 +ab-b)
-6(x-y)^3 +18(y-x)^2 -24(y-x) ^3
= 6(y-x)^2 [(y-x)+3-4(y-x)]
=6(y-x)^2 (3x-3y+3)
=18(x-y+1)(x-y)^2
-5x^2 +10xy-25xy^2
=-5x(x-2y+5y^2)
a(a-b)+(a-b)^2
=(a-b)[a+(a-b)]
=(a-b)(2a-b)
-a^2 b+5ab
=-a(ab-5b)
3a^2 b-6ab+9b
=3(a^2 -2ab+3b)
满意敬请采纳,不理解欢迎追问
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1.(3x-4y)(5x-6y)-(7x-8y)(6y-5x)
=(3x-4y(*5x-6y)+(7x-8y)(5x-6y)
=(5x-6y)(3x-4y+7x-8y)
=2(5x-6y)²
2. 6(x-2)²+8(2-x)
=6(x-2)²-8(x-2)
=2(x-2)(3x-6-4)
=2(x-2)(3x-10)
3.2a+4a²b+2
=2(a+2a²b+1)
4.a(a-b)²-b(b-a)
=a(a-b)²+b(a-b)
=(a-b)(a²-ab+b)
5.-6(x-y)³+18(y-x)²-24(y-x)³
=-6(x-y)³+18(x-y)²+24(x-y)³
=18(x-y)²+18(x-y)³
=18(x-y)²(1+x-y)
6. -5x²+10xy-25xy²
=-5x(x-2y+5y²)
7.a(a-b)+(a-b)²
=(a-b)(a+a-b)
=(a-b)(2a-b)
8.-a²b+5ab
=-ab(a- 5)
9. 3a²b-6ab+9b
=3b(a²-2a+3)
=(3x-4y(*5x-6y)+(7x-8y)(5x-6y)
=(5x-6y)(3x-4y+7x-8y)
=2(5x-6y)²
2. 6(x-2)²+8(2-x)
=6(x-2)²-8(x-2)
=2(x-2)(3x-6-4)
=2(x-2)(3x-10)
3.2a+4a²b+2
=2(a+2a²b+1)
4.a(a-b)²-b(b-a)
=a(a-b)²+b(a-b)
=(a-b)(a²-ab+b)
5.-6(x-y)³+18(y-x)²-24(y-x)³
=-6(x-y)³+18(x-y)²+24(x-y)³
=18(x-y)²+18(x-y)³
=18(x-y)²(1+x-y)
6. -5x²+10xy-25xy²
=-5x(x-2y+5y²)
7.a(a-b)+(a-b)²
=(a-b)(a+a-b)
=(a-b)(2a-b)
8.-a²b+5ab
=-ab(a- 5)
9. 3a²b-6ab+9b
=3b(a²-2a+3)
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