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初一数学下册教案二元一次方程组

2025-03-25 06:07:04

推荐回答（4个）

回答1：

3x+4y=5 (1)
-7x+9y=-2/5 (2)
(1)×9-(2)×4
27x+28x=45+8/5
55x=233/5
x=233/275
y=)5-3x)/4=169/275

回答2：

4y=5-3x
y=5/4-3/4x
代入2式
-7x+9(5/4-3/4x)=-2/5
同时乘以20
-140x+25*9-15*9x=-8
275x=233
x=233/275
y=169/275

回答3：

1方程*9 - 2方程*4

回答4：

x=233/275
y=)5-3x)/4=169/275

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