问题
填空题
已知方程组
|
答案
把得
代入方程组x=3 y=-2
⇒ax+by=2 cx-7y=8
，3a-2b=2 3c+14=8
解得：c=-2，
再把解
代入ax+by=2，x=-2 y=2
∴
，3a-2b=2 -2a+2b=2
解得：
，a=4 b=5
∴abc=4×5×（-2）=-40．
故答案为：-40．
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已知方程组
|
把得
代入方程组x=3 y=-2
⇒ax+by=2 cx-7y=8
，3a-2b=2 3c+14=8
解得：c=-2，
再把解
代入ax+by=2，x=-2 y=2
∴
，3a-2b=2 -2a+2b=2
解得：
，a=4 b=5
∴abc=4×5×（-2）=-40．
故答案为：-40．
| 完形填空。 | |||
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