随堂演练
填空题
1. (4×103)×(3×105)=______．
2. 3a2y5·(5ab2y)=__________．
3.(－5x)(－)()＝ ．
4. [5(x+1)m][3(x+1)2y]=_________．
5. 计算：5a2b·(ab3)3=________.
计算题
6. (3x)·2xy3·4y
7. (2x)3·(5x2y)
8. 3x2(3xy)2－x2(x2y2＋2x)
答案
1. 1.2×109 2. 15a3b2y6 3. xy2z3ab2 4. 15(x+1)m+2y 5. 5a5b10
6. 解：原式＝24x2y4
7. 解：原式=8x3(5x2y)
＝40x5y
8. 解：原式=3x2·9x2y2－x4y2+2x3
=27x4y2－x4y2+2x3
=26x4y2+2x3
