x+y=100 87.5%x+75%y=(x+y).81%
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x+y=100 87.5%x+75%y=(x+y).81%
x+y=100 87.5%x+75%y=(x+y).81%
x+y=100 87.5%x+75%y=(x+y).81%
87.5%x+75%y=(x+y).81% 两边乘100 移项
87.5X-81X=81Y-75Y
6.5x=6y
x=100-y
6.5(100-y)=6y
650-6.5y=6y
12.5y=600
y=48
x=52
A x+y=100
B 87.5%x+75%y=(x+y).81%
将A代入B
D 87.5%x+75%y=81
由A得
C X=100-Y
将C代入D
87.5-87.5%Y+75%Y=81
12.5%Y=6.5
Y=52
X=48
x+y=100 87.5%x+75%y=(x+y).81%
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
x+x+x+x+y+y+y=56
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算?
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
x-y/x+y=(x-y)²/x²-y²(x≠y)
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
328-y/y x 100%=-18%
x+y=100 x×87.5%+y×75%=100×81%
x+y=100 x×87.5%+y×75%=100×81%