x/3-y/4=1推出4x-3y=12,即8x-6y=24-----(1)x/2+y/3=2推出3x+2y=12,即9x+6y=36-----(2)(1)+(2)得17x=60,x=60/17y=12/17
3/x=1+4/yx=3y/(y+4)2/(3y/(y+4))+3/y=2y=3.5 x=1.4
由(1)得4x+3y=60(3)由(2)得-3x+2y=6(4)(3)×3+(4)×4得17y=204∴y=12把y=12代入(4)得x=6∴x=6y=12