(1+30%)x+(1+20%)y=7250求x和yx
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1=x+y 2=20x+30y
请问60%x+20%y=30%(x+y) 怎么得到x:y=1:3
{6/x+y+10/x-y=30 6/x+y-10/x-y=-1
y'/y=1/x
x-80=y,(1-25%)x+30=(1+20%)y问x=?y=?
X/30+Y/20=1
已知x+y=30,x-y=20,求1/5(x-3y)²-12.7的值
y-x=30 y+1=3(x+1)
y'-(1/x)y=xe^-x
1/(x+y)-1/(x-y)=-3/20,2/(x+y)+3/(y-x)=-(1/5)急啊!
集合N={(x,y)|(x-1)^2}+(y-1)^20},M={(x,y)|x^2+y^2
解方程组:x+y=xy=11 (1) x*x*y+x*y*y=30 (2)
已知x y为实数,且(x+y)(x+y+1)=20 求x+y的值
x>0,y>0 2x+5y=20 1/x+1/y的最大值
x+y=540 (x+30)÷y=2/1 x=?y=?
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2