y=30--1/ 2 (5-x)( y /x )--1 /2 x(12-y/ x )化简 呐呐,有些难看,将就着吧
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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
方程组:第一题(5+1)x=5y 第二题x-y/3=x+y/2 4y-4x=30+10 2x-3y=7(5+1)x=5y x-y/3=x+y/2 4y-4x=30+10 2x-5y=7 上面那个题目错的
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
方程组:x(y+1)+2(y+1)=y(y-1)x-5(y-1) x(4+y)-y(8-x)=-20x(y+1)+2(y+1)=y(y-1)x-5(y-1) x(4+y)-y(8-x)=-20(这是一个方程组.)
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
x+y=540 (x+30)÷y=2/1 x=?y=?
若(5x+y)/(7x+10y)=1/2则x/y=
(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!
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1)/8=3-(0.8x-5y)/41=-=
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
30x=4/5y 40(x-1)=y+25 1/3(x+y)=33-1/2x=2(3-1/2y)
先化简再求值(x-y)(x-2y)-1/2(2x-3y)(x+2y),其中x=2,y=2/5
(5x-y)(y+5x)-(3y+2x)(3y-2x) x=1 y=2先化简再求值
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
2x-y-(2y平方-x平方)-5x+y+(x平方+2y平方),x=-1,y=1