4x+5y=98 x=y-2 解得

解方程组4x+y=53x-2y=1得x=1y=1，把 十万分,[3x+2y]/2=[2x+y]/3=[x-y+1]/4 解得. 若{4x+5y=2 ① 5x+4y=7 ② 则{ x+y=___ x-y=____ 解之得:｛x=_____ y=___ 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2() 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12