[x-12]陈6=108
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(6x+12)/(x²+4x+4)+(x²-4x+4)/(x²-4)=(x²-4)/(x²-4x+4)6(x+2)/(x+2)²+(x-2)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
x+9x=6x*2+1212x-x-9x=-122x=-12x=-12÷2x=-6x+9-x/3=4两边乘33x+9-x=123x-x=12-92x=3x=3÷2x=3/2
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)
3x-4*6.5=7.63x-26=7.63x=7.6+263x=33.6x=33.6÷3x=11.212.5x+x=10813.5x=108x=108÷13.5x=83(x-2.1)=8.4x-2.
提出x得到:x*(1-1/2+1/2-1/3+1/3-1/4……+1/2008-1/2009)=2008接着:x*(1-1/2009)=2008最后:x=2009
(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分
解方程x=25x/28+9,得3x/28=9,得x=84
x^3×x^5×x+(x^3)^12+4(x^6)^2=x^(3+5+1)+x^(3×12)+4x^(6×2)=x^8+x^36+4x^12
2x(x-3)-(x-3)(x+6)=x²+122x^2-6x-(x^2+3x-18)=x^2+12-9x+6=0x=2/3
x-o.8x=6X=3012x-8x=4.8X=1.23x-8=16X=8x-0.7x=3.6X=127.5x-2x这题没有=
x/2+x/6+x/12+x/20+x/30+x/42=136x/42=1x=7/6
2x=12x=6
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/[(x+3)(x-2)]+(2x-5)/[(x-4)(x+3)]=(7x
1/6x+1/12x+1/7x+5+1/2x+4=x2/12x+1/12x+6/12x-12/12x+1/7x=-9-1/4x+1/7x=-9-7x+4x=-9*28-3x=-9*28x=84
f'(x)=3x2-12,当x∈[−13,1]时,f'(x)<0,∴x∈[−13,1],函数f(x)的单调减函数,又因为f(−13)=27,f(1)=-5,所以当x=-13时,f(x)max=27,当
原方程化为:(1/2+1/6+1/12+1/20+1/30+1/42)x=6【(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)】x=6
你懒惰了,通分得:50x=300x=6
50x/60=5x=6
原方程等于:【(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/2009-1/2010)】x=2009【1-1/2+1/2-1/3+1/3-1/4+1/4……-1/2009+1/20