1.3x+2y=21 (1)2x-y=14 (2)(1)=(2)*2得:7x=49x=7代入(2)得:y=0所以:方程组得解是:x=7;y=02.x/4+y/3=7 (1)x/3+y/2=8 (2)(1)*6-(2)*4得:3x/2-4x/3=109x-8x=60x=60代入(2)得:y=-24方程组得解是:x=60;y=-24