解:已知:x=10%﹙y+1﹚ →10x=y+1→y=10x-1 x+1=20%﹙y+1+1﹚→5x+5=y+2→y=5x+3 得 10x-1=5x+3 →x=4/5 →y=7即 原方程组的解为 x=4/5 ,y=7
x=10%﹙y+1﹚ x=0.1y+0.1代入x+1=20%﹙y+1+1﹚0.1y+0.1=0.2y+0.40.1y=-0.3所以y=-3x=0.1y+0.1=-0.2