设为x和y则x+y=100x+3=y-3得x=47y=53
-5x+4=3x-4 -5x-3x=-4-4-8x=-8x=1-2x=-5/6x+2-10x=-6x+10-4x=10x=-5/23x-4/1=-4/x+112x-1=-x-111x=0x=0100=(50+3)+(50-3)=100
