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分解因式 x²-6xy+5y²; m²-5m-6; m²-m-6; 3x²+13x-10; 6m²+m-12.
x²-2xy+y²-5x+5y-6;
x³-x²-x+1;
1-x²+4xy-4y²;
a²-b²-c²+2bc;
计算(a-b)²+2(a-b)(b-c)+(c-b)²的值,其中a-c=—1.4.
人气:189 ℃ 时间:2020-04-02 05:11:43
解答
x²-2xy+y²-5x+5y-6;=(x-y)²-5(x-y)+6=(x-y-2)(x-y-3)x³-x²-x+1;=x²(x-1)-(x-1)=(x-1)(x²-1)=(x-1)²(x+1)1-x²+4xy-4y²;=1-(x-2y)²=(1+x-2y)(1-x+2y)a...
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