十字相乘法练习题(2) (1)2x2x3 (4)2x213x15 (7)7x45x22 (10)7x411x2y26y4 (13)a34a212a (16)2(ab)2(ab)3 (18)4(x2y)28x16y3 (20)8a2b222abcd15c2d2 (21)2ma410ma2b28mb4 (19)9xn215xn16xn (17)4(2xy)28(2xy)3 (14)6x211xy10y2 (15)2(mn)2(mn)3 (11)5x3y7x2y6xy (12)2a2ay15y2 (8)7x411x26 (9)7x45x2y22y4 (5)3b214b5 (6)29a5a2 (2)2x25x7 (3)3a22a1 (1)已知两数之积为15,和为2,则此两数为 . (2)若多项式2x2xyy2mx5y6可以分解为(xy2)(2xy3),则m= . (3)把多项式12a4bn79a2b3n25b5n 分解因式,并注明每一步因式分解所用的方法. (4)已知(x2y2)(x2y21)120,求x2y2的值. 本文来源:https://www.wddqw.com/doc/470e13231ed9ad51f01df278.html