题目内容
计算:
(1)(-4ab3)•(-2ab)-(2ab2)2;
(2)(-3x2y)2•(-
xyz)•
xz2.
(1)(-4ab3)•(-2ab)-(2ab2)2;
(2)(-3x2y)2•(-
| 2 |
| 3 |
| 3 |
| 4 |
(1)(-4ab3)•(-2ab)-(2ab2)2
=8a2b4-4a2b4
=4a2b4;
(2)(-3x2y)2•(-
xyz)•
xz2
=9x4y2•(-
xyz)•
xz2
=-
x6y3z3.
=8a2b4-4a2b4
=4a2b4;
(2)(-3x2y)2•(-
| 2 |
| 3 |
| 3 |
| 4 |
=9x4y2•(-
| 2 |
| 3 |
| 3 |
| 4 |
=-
| 9 |
| 2 |
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