解方程组:{x+y=57 120%x+110%y=470
问题描述:
解方程组:{x+y=57 120%x+110%y=470
答
由(1)得1.1X+1.1Y=62.7 (3)
由(2)得1.2X+1.1Y=470 (4)
(4)-(3)得0.1X=407.3,解得X=4073,Y=-4016