题目内容
______-2xy+4y2=(______)2;x2+
x+______=(______)2.
| b |
| a |
∵2y×
x=2xy,
∴
x2-2xy+4y2=(
x-2y)2,
∵x×
=
x,
∴x2+
x+
=(x+
)2.
故答案为:
x2,
x-2y,
,x+
.
| 1 |
| 2 |
∴
| 1 |
| 4 |
| 1 |
| 2 |
∵x×
| b |
| 2a |
| b |
| a |
∴x2+
| b |
| a |
| b2 |
| 4a2 |
| b |
| 2a |
故答案为:
| 1 |
| 4 |
| 1 |
| 2 |
| b2 |
| 4a2 |
| b |
| 2a |
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