题目内容
计算:(-2m-3n)(3n-2m)=______; (-a+
b)2=______.
| 3 |
| 2 |
(-2m-3n)(3n-2m)
=(-2m)2-(3n)2
=4n2-9m2;
(-a+
b)2=a2-3ab+
b2.
故答案是:4n2-9m2,a2-3ab+
b2.
=(-2m)2-(3n)2
=4n2-9m2;
(-a+
| 3 |
| 2 |
| 9 |
| 4 |
故答案是:4n2-9m2,a2-3ab+
| 9 |
| 4 |
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