单项式乘单项式评价练习1计算:2计算:(2a2)2a4(5a4)23计算:(3x2y)2(xyz)xz24计算:5ab3(a3b2)(ab4)25若(am+1bn+2)(a2n+1b2n)a5b3,求m+n的值参考答案1计算:解:=a4b2c2计算:(2a2)2a4(5a4)2=4a4a425a8=4a825a8=21a83计算:(3x2y)2(xyz)xz2=9x4y2(xyz)xz2=x6y3z3 4计算: 5ab3(a3b2)(ab4)2=5ab3(a3b2)a2b8=a6b135若(am+1bn+2)(a2n+1b2n)a5b3,求m+n的值解:(am+1bn+2)(a2n+1b2n)a5b3,解得:,故m+n=第2页(共2页)