用代入消元法解二元一次方程组{x=2y① 2x+y=1② {4x+10y=3.6 15x-10y=8 {4x+y=2 4x-3y=-6用代入消元法解二元一次方程组{x=2y① 2x+y=1②{4x+10y=3.615x-10y=8{4x+y=24x-3y=-6

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