单项式乘以单项式一、计算:(1)xxy243(2)xyzyx1655232
(3)4 y·(-2xy3 ) ;(4))()(63103102(5)23223)41)(21(yxyx(6)yxyxnn21238
0)(54)(25
0(323yxxyxy(8)xyzyxxyyx))(21)(2(2222(9)2112613yxyxnnn 10)])2(31[)2(23232xyabyxa(1))83(4322yzxxy(2))312)(73(3323cbaba(3))125
3322nmmn(4))53(32)21(322yzyxxyz(5))2
2()31(522 yxaxyaxx(6)3322)2()5
0(52xyxxyyx(7))47(123)5(232yxyxxy(8)23223)4()()6()3(5aabababbba(1))83(4322yzxxy(2))312)(73(3323cbaba(3))2
2()31(522yxaxyaxx(4)3322)2()5
0(52xyxxyyx(5))47(123)5(232yxyxxy(6)23223)4()()6()3(5aabababbba单项式乘多项式(1)(2xy2-3xy) · 2xy; (2)-x(2x +3x2-2) ;(3) -2ab(ab-3ab2-1) ;(4)( 34an+1-b2) · ab
(5)-10mn · (2m2n-3mn2)
(6)(-4ax)2· (5a2-3ax2)
(7)(3x2y-2xy2) · (-3x3y2)2
(8)7a(2ab2-3b)
(9)x(x2-1)+2x2(x+1)-3x(2x-5)
(﹣ a2b)( b2﹣ a+ )(9)
(﹣ 2a2b)3(3b2﹣4a+6)10.2ab(5ab+3a2b) 11