解方程组；x/2-y/5=4；x/7-y/15=3

解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组 x+y/5+x-y/2=7 4(x+y)-5(x-y)=2 解方程组x+y/2+x-y/2=7,4(x+y)-5(x-y)=2... 解方程组8y+5x=84y-3x=7 方程组 因式分解 4x^3-4x^2y-(x-y) 解方程组 3x-5y=7 4x+2y=5解方程组3x-5y=74x+2y=5 解方程组3x+5(x+y)=2 3y-2(x+y)=4 解方程组3分之x-y=2分之 x+y解方程组3分之x-y=2分之 x+y；2x-5y=7 用代入法解此方程组：（x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2求方程组的正整数解：x+y+z=7 2x+3y+4z=20 解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16 解方程组题目一道(x+y)(x-2y)=-5(x-y)(x+2y)=7 解方程组6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 解二元一次方程组{x+y/2+x-y/3=6,4(x+y)-2=5(x-y) 解方程组2分之x+y+3分之x-y=6 4(x+y)-5(x-y)=2 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()