作业帮2x/(x^2+x)-1/x=5/(x+1)怎么做?急!
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2x/(x^2+x)-1/x=5/(x+1)怎么做?急!
2x/(x^2+x)-1/x=5/(x+1)怎么做?
急!
2x/(x^2+x)-1/x=5/(x+1)怎么做?急!
2x/(x^2+x)-1/x-5/(x+1)=2x/[x(x+1)]-(x+1)/[x(x+1)]-5/(x+1)
=(x-1)/[x(x+1)]-5x/[x(x+1)]
=-(4x+1)/[x(x+1)]
=0
4x+1=0
x=-1/4
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填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x(x-2)-2x(x+1)-3x(x-5) 其中x=负½
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
f(x,-x)=x^2+2x,fx(x,-x)=5x+1,则fy(x,-x)=
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X
x/x平方-x+2=2x/x+1
x^5-x^4+x^3-x^2+x-1
x^6-x^5+x^4-x^2+x-1
(X+1)X(X+2)X(X+3)=504
2x(x-1)-x(2x-5)=15