(1)(x+a)×(x+b);
(2)(3x+7y)(3x-7y);
(3)(3x+9)(6x+8);
(4)(
x
2y-2xy+y
2)×3xy.
人气:402 ℃ 时间:2020-05-04 16:41:04
解答
(1)(x+a)×(x+b)=x
2+ax+bx+ab;
(2)(3x+7y)(3x-7y)=9x
2-49y
2;
(3)(3x+9)(6x+8)=18x
2+24x+54x+72=18x
2+78x+72;
(4)(
x
2y-2xy+y
2)×3xy.=
x
3y
2-6x
2y
2+3xy
3;
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