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共找到 96018 与x-2 相关的结果,耗时257 ms
lim x趋于0 1-cosx^2/x^2sinX^2(1-cosx^2)/x^2sinx^2=[1-1-2sin^2(x^2/2)]/x^2sinx^2=2sin^2(x^2/2)/x^2sinx^2=(x->0)2(x^2/2)^2/x^2*x^2=1/2第二步是
数学
么来的?(1-cosx^2)
化简:(1)x^2-4y^2/
x-2
y(2)a^3-2a/a(3)x^2-x/x-1(4)(x+2)^2-(
x-2
)^2/x化简:(1)x^2-4y^2/
x-2
y(2)a^3-2a/a(3)x^2-x/x-1(4)(x+2)^2-(
x-2
)^2/x(5)x^2-2xy+
数学
^2-2xy+y^2-1/x
探究题:(x-1)(x+1)=x^2-1(x-1)(x^2+x+1)=x^3-1探究题:(x-1)(x+1)=x^2-1(x-1)(x^2+x+1)=x^3-1(x-1)(x^3+x^2+x+1)=x^4-1...(1).试求2^6+2^5+2^4+2^3+2^2+2+
数学
+1的值(2).判断2^20
已知x/(x^2+x+1)=1/4,求分式x^2/(x^4+x^2+1)的值我查到了2种方法啊貌似都对啊到底是哪一种啊--已知x/x^2+x+1=1/4,求分式x^2/x^4+x^2+1的值1.x/x^2+x+1=1/4x^2+x+1=4xx+1+1/x=4x+1/x
数学
x+1/x=3x^2/x^4
解分式方程:1/X-2+1/X-6=1/X-7+1/X-11/X-2+1/X-6=1/X-7+1/X-11/(
x-2
)-1/(x-1)=1/(x-7)-1/(x-6)(x-1-x+2)/(
x-2
)(x-1)=(x-6-x+7)/(x-7)(x-6)1/(
x-2
)(x-
数学
)=1/(x-7)(x-6)
(1)2x^2+3x-1(2)x^3-8y^3-z^3-6xyz(3)x^3-9x+8(4)x^9+x^6+x^3-3(5)(m^2-1)(n^2-1)+4mn(6)(x+1)^4+(x^2-1)^2+(x-1)^4(7)a^3b-ab^3+a^2+b^2+1(8)(
数学
^2+x+1)(x^2+x+
(x+1)(x+1)=x^2-1(x-1)(x^2+x+1)=x^3-1(x-1)(x^3+x^2+x+1)=x^4-1(x-1)(x^4+x^3+x^2+x+1)=x^5-1①观察并试求2^6+2^5+2^4+2^3+2^2+2+1②判断2^2008+2^2007+
数学
^2006+…+2^2+2+
1.x^2-1/x^2+2x+1÷2x^2-2/ax^2+8x+4÷(x-1)^22.(x^2-y^2/xy)^2÷(x+y)·(x/x-y)^33.已知分式x^3-2x^2y/x^2y-2xy^2,其中x=3,y=14.已知x/y=1/2,求x^2+2xy+y^2/
数学
^2-xy-2y^2的值5.
1.(X^2+X+1)*(X^2+X+2)-122.(X^2+10X+4)*(x^2+10
x-2
)-553.1999x^2-(1999^2-1)*X-19994.(X^2+4X+8)^2+3X(X^2+4X+8)+2X^25.(X^2+7X+6)(X^2+5X+6)+X
数学
^26.(X+1)(X+2)
1.计算(x-y+4xy/(x-y))(x+y-4xy/(x+y))2.已知x/(x^2-x+1)=7求x^2/(x^4+x^2+1)3.已知2x-3y+z=0,3
x-2
y-6z=0xyz≠0求(x^2+y^2+z^2)/(2x^2+y^2-z^2)4.解方程(x^2-
数学
(x^2-x+1)/(x^
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