(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
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(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
初二下的分解因式.可能要用到简便运算.
初二下的分解因式.可能要用到简便运算.
(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
=[(x+1/x+1)+(1/x+1)]- [(x+3/x+3)+(1/x+3)]- [(x+2/x+2)+(1/x+2)]+ [(x+4/x+4)+(1/x+4)]
=(1/x+1)- (1/x+3) - (1/x+2) +(1/x+4)
=[(1/x+1)+(1/x+4)]- [(1/x+2)+(1/x+3)]
=[(x+4+x+1)/[(x+1)(x+4)] [(x+3+x+2)/(x+2)(x+3)]
=(2x+5){ [1/(x+1)(x+4)] -[1/(x+2)(x+3)]}
这里把分母整理 演算 得
=(2x+5) [2/(x+1)(x+2)(X+3)(x+4)]
=(4x+10)/(x+1)(x+2)(X+3)(x+4)
=[(x+1/x+1)+(1/x+1)]- [(x+3/x+3)+(1/x+3)]- [(x+2/x+2)+(1/x+2)]+ [(x+4/x+4)+(1/x+4)]
=(1/x+1)- (1/x+3) - (1/x+2) +(1/x+4)
=[(1/x+1)+(1/x+4)]- [(1/x+2)+(1/x+3)]
=[(x+4+x+1)/[(x+1)(x+4)] [(x+3+x+2)/(x+2)(x+3)]
=(2x+5){ [1/(x+1)(x+4)] -[1/(x+2)(x+3)]}
这里把分母整理 演算 得
=(2x+5) [2/(x+1)(x+2)(X+3)(x+4)]
=(4x+10)/(x+1)(x+2)(X+3)(x+4)
(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(x-1)^3(x+1)(x-2)/(x+4)
(x+1)(x+2)(x+3)(x+4)+1
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x(2x-5)>2x的平方-3x-4 (x+1)(x-3)+8x>(x+5)(x-5)-2 解不等式组
x(x^2-1)+2x^2 *(x+1)-3x*(2x-5)=x(3x^2-4x)-28
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)
5x-3(2x+1)=6x-4(5-3x)求x
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)