www.fltk.net > 易解方程:5x+2/2=3

易解方程:5x+2/2=3

5x+2-18/2=3 解:5x-7=35x=3+7 5x=10 x=2

(5x+2)/2=2x-(4x-3)/6 3(5x+2)=2xX6-(4x-3) 15x+6=12x-4x+3 7x=3-6 x=-3/7

(4/5+2/15)x=2/3 (14/15)x=2/3 x=2/3×15/14=5/7

x-1/5x=2/3 4/5x=2/3 x=5/6

(2x-1)÷2-x+2=(5x+2)÷3-(x+3)÷6 两边同乘以6 3(2x-1)-6x+12=2(5x+2)-(x+3) 6x-3-6x+12=10x+4-x-3 9=9x+1 9x=9-1 9x=8 x=8/9

5X²-4X-1/4-X²-3/4X=0 4x²-19/4X-1/4=0 两边同时乘以4 16x²-19x-1=0 直接用求根公式计算: x=19/32±5√13/32 希望能帮到你啊,不懂可以追问,如果你认可我的回答请点击下方选为满意回答按钮,谢谢! 祝你学习进步

5x+2=7x-8 7x-5x=2+8 2x=10 x=10÷2 x=5

(1)原方程可变形为:x(x+16)=0,x=0或x+16=0.∴x1=0,x2=-16.(2)原方程可变形为x2-2x+1=0,(x-1)2=0.∴x1=x2=1.(3)原方程可变形为(x-3)(x+1)=0,x-3=0或x+1=0∴x1=3,x2=-1.(4)原方程可变形为2(x-3)2+x2-9=0,(x-3)(2x-6...

用消元法。 x1+2x2+3x3=6 ① 4x1+5x2+6x3=15 ② 7x1+8x2+9x3=24③ ②-①*2,得2x1+x2=3,④ ③-①*3,得4x1+2x1=6.⑤ ④⑤同解,x2=3-2x1,代入①, x1+6-4x1+3x3=6, x3=x1.x1可以是任意数。

网站地图

All rights reserved Powered by www.fltk.net

copyright ©right 2010-2021。
www.fltk.net内容来自网络,如有侵犯请联系客服。zhit325@qq.com