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【单选题】
用解方程组 3x+4y=1(1) 2x-y=5(2) 能使后化简比较简单的变形是（　　）
A.
由（1）得x= 1-4y 3
B.
由（1）得y= 1-3x 4
C.
由（2）得x= y+5 2
D.
由（2）得y=2x-5
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