ldcf.net
当前位置:首页 >> 解下列方程:(1)7x?13?5x+12=2?3x+24;(2)2(... >>

解下列方程:(1)7x?13?5x+12=2?3x+24;(2)2(...

(1)移项,得10x-5x=12+15,合并同类项,得5x=27,方程的两边同时除以5,得x=275;(2)去括号,得x+16=2x?13,方程的两边同时乘以6,得x+1=4x-2,移项、合并同类项,得3x=3,方程的两边同时除以3,得x=1.

(1)去括号,得:2x-x-10=5x+2x-2,移项,得:2x-x-5x-2x=10-2,合并同类项,得:-6x=8,解得:x=-43;(2)去分母,得:18x+3(x-1)=18-2(2x-1),去括号,得:18x+3x-3=18-4x+2,移项,得:18x+3x+4x=18+3+2,合并同类项,得:25x=23,解得...

(1) x/12-1=2x/15 5x-60=8x 8x-5x=-60 3x=-60 x=-20

1/(x^2+x)+1/(x^2+3x+2)+1/(x^2+5x+6)+1/(x^2+7x+12)+1/(x^2+9x+20) =1/x(x+1)+ 1/(x+1)(x+2) + 1/(x+2)(x+3)+ 1/(x+3)(x+4)+ 1/(x+4)(x+5) =[1/x - 1/(x+1)]+[1/(x+1) - 1/(x+2)]+[1/(x+2) - 1/(x+3)]+[1/(x+3) - 1/(x+4)]+[1/(x+4) - 1/...

解方程 3X+24=5X-12移项得 24+12=5X-3X合并同类项得 36=2X两边同除以未知数系数2得 X=18 经检验X=18是原方程的解

5×-3×=12+12 2×=24 ×=24÷2 ×=12

X-6/15X-5/15X+12=24 1/15X=12 X=12×15 X=180

(1)50,(2)100(3)7/4(4)20 (5/7X4/7+4/7)÷4/7 =12/7 1/5÷{(2/3+1/5)x1/13}=3

(1)移项得:2x2-5x=-1,x2-52x=-12,配方得:x2-52x+(54)2=-12+(54)2,(x-54)2=1716,开方得:x-54=±174,x1=5+174,x2=5?174.(2)(x+1)(x+8)=-12,x2+9x+20=0,(x+4)(x+5)=0,x+4=0,x+5=0,x1=-4,x2=-5.

C

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