题目内容
计算:(2a+
)2=______.已知:m+
=3,则m2+
=______.
| b |
| 2 |
| 1 |
| m |
| 1 |
| m2 |
①(2a+
)2=(2a)2+2×2a×
+(
)2=4a2+2ab+
.
②由已知得(m+
)2=32,
即m2+
+2=9,
∴m2+
=7.
| b |
| 2 |
| b |
| 2 |
| b |
| 2 |
| b2 |
| 4 |
②由已知得(m+
| 1 |
| m |
即m2+
| 1 |
| m2 |
∴m2+
| 1 |
| m2 |
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