请问此题何解?8x+2y=12218.5 5x+5y=12258 注:y>x
请问此题何解?8x+2y=12218.5 5x+5y=12258 注:y>x
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
用代入法解此方程组:(x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2
2x=5(x+y) 3x-10(x+y)=2 用代入法解此方程组
5x+6y+3x-4y+3-x+x =5x+3x-x+x+6y-4y+3 =8x=2y+3 谁能告诉我这题合并同类项的解
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
解方程组x:y=2:3和5x+3y=38 3y+x/y=8和9y-2x/y=9
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5