代入法:1.由5x-y=1得y=5x-1代入3x=5y,得3x=5(5x-1),3x=25x-5,所以x=5/22,y=21
加减消元法:2.由x/35-2=y减去x/50+1=y得10x-7x-1050=0,所以x=350,y=8
代入法:3.由3x+2y-2=0得3x+2y=2代入 3x+2y+1/5-2x=-2/5得:2+1/5-2x=-2/5,10+3-10x=0
所以x=13/10,y= -17/10
代入法:1.由5x-y=1得y=5x-1代入3x=5y,得3x=5(5x-1),3x=25x-5,所以x=5/22,y=21
加减消元法:2.由x/35-2=y减去x/50+1=y得10x-7x-1050=0,所以x=350,y=8
代入法:3.由3x+2y-2=0得3x+2y=2代入 3x+2y+1/5-2x=-2/5得:2+1/5-2x=-2/5,10+3-10x=0
所以x=13/10,y= -17/10