求解(1){2x-y=9 3x+y=7 (2){4x-3y=5.6 5x+3y=7.4 (3){2x+3y+19=0 x+5y-1=0(4){x+y/2+x-y=1 4(x+y)-5(x-y)=2
问题描述:
求解(1){2x-y=9 3x+y=7 (2){4x-3y=5.6 5x+3y=7.4 (3){2x+3y+19=0 x+5y-1=0
(4){x+y/2+x-y=1 4(x+y)-5(x-y)=2
答