2x-1/5+3y-2=2两边乘52x-1+15y-10=102x+15y=21 (1)3x+1/3-3y+2/4=4/3 两边乘1212x+4-9y-6=164x-3y=6 (2)(1)+(2)×522x=51x=51/22y=(4x-6)/3=12/11
