1.2x^2+15x+7 2.3a^2-8a+4 3.5x^2+7x-6 4.6y^2-11y-10 5.5a^2b^2
2个回答
那么多题才十分,强烈要求加分
1.2x^2+15x+7
=(2x+1)(x+7)
2.3a^2-8a+4
=(3a-2)(a-2)
3.5x^2+7x-6
=(5x-3)(x+2)
4.6y^2-11y-10
=(2y-5)(3y+2)
5.5a^2b^2+23ab-10
=(5ab-2)(ab+5)
6.3a^2b^2-17abxy+10x^2y^2
=(3ab-2xy)(ab-5xy)
7.m^3-m^2-20m
=m(m^2-m-20)=m(m-5)(m+4)
8.3a^3b-6a^2b-45ab
=3ab(a^2-2a-15)=3ab(a-5)(a+3)
9.4-(3a+2b)^2
=(2-3a-2b)(2+3a+2b)
10.(x^2+4)^2-16x^2
=(x^2+4-4x)(x^2+4+4x)=(x-2)^2(x+2)^2
11.(3a-4b)(7a-8b)+(11a-12b)(7a-8b)
=(3a-4b+11a-12b)(7a-8b)=(14a-16b)(7a-8b)
12.(二分之一x+二分之三x-三分之四z)^2-(二分之一x-二分之三x-三分之四z)^2 [是不是题目错了 二分之三y?]
=(x/2-4z/3)^2-(3x/2)^2
13.x^3z-4x^2yz+4xy^2z
=xz(x-2y)^2
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