ldcf.net
当前位置:首页 >> (1/6X+4)÷(X+4)=1/4 >>

(1/6X+4)÷(X+4)=1/4

6x+4(x-1)=14解方程 6x+4x-4=14 10x=14+4 x=18/10 x=1.8

(1) (2)18.4 (3)20 (4)13 (5) (6)

1/2X4+1/4X6+1/6X8+1/8X10+1/10X12 =(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12)÷2 =(1/2-1/12)÷2 =5/12÷2 =5/24

1/2×4+1/4×8+1/6×8+...+1/2012×2014 =1/2×(1/2-1/4)+1/2×(1/4-1/8)+...+1/2×(1/2012-1/2014) =1/2×(1/2-1/4+1/4-1/8+...+1/2012-1/2014) =1/2×(1/2-1/2014) =1/2×(1007/2014-1/2014) =1/2×1006/2014 =503/2014 此题属于裂项问题,主要涉及的公式...

(1/20x+1/6x)-(x-1/2x-1/8x)=4 两边同乘以120得: (6x+20x)-(120x-60x-15x)=480 6x+20x-120x+60x+15x=480 -19x=480 x=-480/19

4-6x=(2x-1)÷2+3 4-6x=x-1/2+3 4+1/2-3=7x 3/2=7x x=3/2x1/7=3/14

f(x)=(x²+6x-1)÷(x+1) (x≠-1) =[(x²+2x+1)+4(x+1)-6]/(x+1) =[(x+1)²+4(x+1)-6]/(x+1) =(x+1)-6/(x+1)+4 对称性: f(x)图像关于点(-1,4)成中心对称 单调性: f(x)在(-1,+∞),和(-∞,-1)上分别是增函数 x>-1时,x+1>0递增,6/(x+1)...

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com