题目内容
电脑上设计了一个有理数运算程序:a*b=a2-b2-2b÷(a-b),求:(-2)*
的值.
| 1 |
| 2 |
原式=(-2)2-(
)2+2×
÷(-2-
)
=4-
-1÷
=4-
-
=
.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=4-
| 1 |
| 4 |
| 5 |
| 2 |
=4-
| 1 |
| 4 |
| 2 |
| 5 |
=
| 67 |
| 20 |
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