解方程组4x+5y=3.5,x-1=1.8-x-6y
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解方程组4x+5y=3.5,x-1=1.8-x-6y
2式化成,2x = 2.8 - 6y,所以x = 1.4 - 3y
代入1式得,4(1.4 - 3y)+ 5y = 3.5
5.6 - 12y + 5y = 3.5
7y = 2.1
所以y = 0.3
带回去解得x = 0.5
代入1式得,4(1.4 - 3y)+ 5y = 3.5
5.6 - 12y + 5y = 3.5
7y = 2.1
所以y = 0.3
带回去解得x = 0.5
解方程组4x+5y=3.5,x-1=1.8-x-6y
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