y=(20+x)(80-2x) =-2x²+40x+1600怎么算
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y=(20+x)(80-2x)=-2x²+40x+1600怎么算y=(20+x)(80-2x)=-2x²+40x+1600怎么算y=(20+x)(80-2x)=-2x²+
y=(20+x)(80-2x) =-2x²+40x+1600怎么算
y=(20+x)(80-2x) =-2x²+40x+1600怎么算
y=(20+x)(80-2x) =-2x²+40x+1600怎么算
y=(20+x)(80-2x)
=20×(80-2x)+x×(80-2x)
=1600-40x+80x-2x²
=1600+40x-2x²
=-2x²+40x+1600
然后再进行配方
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
y=x^2-2x(x
y=x^2+2x(x
3^x+2x=y,x
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x-4y)(2x+y)=
(x+y)(2x-3y)=?
x+y>=2,x-y
x+y>=2,x-y
y'-2y=(e^x)-x