ldcf.net
当前位置:首页 >> 2x+1/8=11/8求解方程 >>

2x+1/8=11/8求解方程

解(1)由-2x^2+12x-8 =-2[x^2-6x+9-9]-8 =-2[(x-3)^2-9]-8 =-2(x-3)^2+10 由2(x-3)^2≥0 即-2(x-3)^2≤0 即-2(x-3)^2+10≤10 即-2x^2+12x-8≤10 故-2x^2+12x-8的最大值为10 即-2x^2+12x-8的值不可能等于11 (2)由x^2-x+1=0 得(x-1/2)^2+3/4=...

41.2x8.1+11x1.25+53.7x1.9=41.2x8.1+11x1.25+(41.2x1.9+12.5x1.9)=41.2x(8.1+1.9)+1.25x(11+19)=412+37.5=449.5

88.8x8.7+11.2x(9.9-1.2) =88.8x8.7+11.2x8.7 =8.7x(88.8+11.2) =8.7x100 =870 请采纳,你的采纳是我上进的动力!可以追问,一直到懂!!

x+5/9=11/12 x=11/12-5/9 x=33/36-20/36 x=13/36 2x-1/5=1/5 2x=1/5+1/5 2x=2/5 x=1/5 2/5-x=1/8 x=2/5-1/8 x=16/40-5/40 x=11/40 谢谢,请采纳

88.8x8.7+11.2x9.9-11.2x1.2 =88.8x8.7+11.2x(9.9-1.2) =88.8x8.7+11.2x8.7 =(88.8+11.2)x8.7 =100x8.7 =870

(1)1.4x+9.8=22.4, 1.4x+9.8-9.8=22.4-9.8, 1.4x=12.6, 1.4x÷1.4=12.6÷1.4, x=9;(2)2(x-3)=11.6, 2x-6=11.6, 2x-6+6=11.6+6, 2x=17.6, 2x÷2=17.6÷2, x=8.8;(3)13x-x=144, 12x=144, 12x÷12=144÷12, x=12;(4)68-4.4x=24...

(1)1.4x+9.8=22.4, 1.4x+9.8-9.8=22.4-9.8, 1.4x=12.6, 1.4x÷1.4=12.6÷1.4, x=9;(2)2(x-3)=11.6, 2x-6=11.6, 2x-6+6=11.6+6, 2x=17.6, 2x÷2=17.6÷2, x=8.8;(3)13x-x=144, 12x=144, 12x÷12=144÷12, x=12;(4)68-4.4x=24...

4/3-8=11/2x 解:20/3=11/2x 11/2x=20/3 x=40/33 0.5x-0.7=6.5-1.3 解:0.5x-0.7=5.2 0.5x=5.2+0.7 0.5x=5.9 x=11.8 1/6(3x-6)=2/5x-3 解:1/2x-1=2/5x-3 1/2x-2/5x=-3+1 1/10x=-2 x=-20 1-2x/3=3x+1/7-3 解:1-2x/3=3x-20/7 3x+2/3x=1+20/7 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