(1)x+y=420,30%x+40%y=160×80% (2)x-y/7-x+y/6=1/2,2(x-y)-5(x+y)+1=0,求方程组解嗷嗷嗷!
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(1)x+y=420,30%x+40%y=160×80% (2)x-y/7-x+y/6=1/2,2(x-y)-5(x+y)+1=0,求方程组解嗷嗷嗷!
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
{6/x+y+10/x-y=30 6/x+y-10/x-y=-1
x+y=540 (x+30)÷y=2/1 x=?y=?
二元一次方程 x+y=450 x(1-60%)=y(1-40%)-30 求X和Y
30x=4/5y 40(x-1)=y+25 1/3(x+y)=33-1/2x=2(3-1/2y)
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
对于(y一撇)y`=y/x(y-1)求导,我求的结果是y``=-y^2-y`x+y/x^2(y-1)^2 怎么不对啊,我的求导过程是:y`x(y-1) - [x(y-1)]` y y`xy-y`x-(y-1+xy`)y -y^2-y`x+yy``=-------------------------=----------------------=-----------------x^2 (y-1
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
y'/y=1/x
X+Y=40,(X*Y)/(X+Y)=7.5
先化简,再求值 (1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009 (2)y(x+y)+(x+y)(x-y)-x的平方,先化简,再求值(1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009(2)y(x+y)+(x+y)(x-y)-x的平方,其中x=-2,y=二分
y=2x*(*代表X)y=(lnx)*y=(x/1+X)*
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
解方程组 30x=4/5y 40(x-1)=y+25
【(x-y)的平方+(x-y)(x+y)】除以x,其中x= -1 y=二分之一
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2