ldcf.net
ǰλãҳ >> 1/3(xʮ1)ʮ3/4(6xʮ6)ʮ2/5xʮo.4=6 >>

1/3(xʮ1)ʮ3/4(6xʮ6)ʮ2/5xʮo.4=6

⣺1/3(x+1)+3/4x6(x+1)+2/5x+0.4=6 1/3(x+1)+3/2x3(x+1)+2/5x=5.6 1/3(x+1)+9/2(x+1)+2/5x=28/5 10(x+1)+9x15(x+1)+12x=28x6 10x+10+9x15x+9x15+12x=28x6 (10+9x15+12)x=28x6-10-9x15 157x=23 x=23/157 ԭһԪһη̵Ľx=23/157

3xʮ2.5x4=28 ⣺3x+10=28 3x=18 x=183 x=6

x-11/15x-32=280 4/15x=312 x=1170

(1) 5x+2y=2 7x-5y=34 ١5+ڡ2ã39x=78x=2 x=2 ٣ã10+2y=2ãy=-4 ԣĽΪx=2y=-4 (2) 8x+3y+2=0 6x+5y+7=0 ١5-ڡ3ã22x-11=0x=1/2 x=1/2٣ã4+3y+2=0ãy=-2 ԣ...

⣺ԭʽ=1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)۲ɵùʽΪ(x+1)(x+2)(x+3)(x+4) =(x+3)(x+4)+(x+1)(x+4)+(x+1)(x+2)/(x+1)(x+2)(x+3)(x+4) =x^2+7x+12+x^2+5x+4+x^2+3x+2/(x+1)(x+2)(x+3)(x+4) =3x^2+15x+18)/(x...

5x-1/31/2 5x=1/2+1/3 5x=5/6 x=5/6*1/5 x=1/6 1-5/8x10 x=103/8 x=10*8/3 x=80/3 8-3/4+2/3x=0 8-3/4-2x/3=0 2x/3=29/4 x=29/4*3/2 x=87/8 1/58x=5/8 8/5x=5/8 25x=64 x=64/25

1/2Xʮ6һ5/12X=6 1/2x+3-5/12x=6 1/2x-5/12x=6-3 1/12x=3 x=36 Ϸǰĸں

3xʮ1=7 3x=7-1 3x=6 x=6/3 x=2 5xһ2=5X2-2=8

3/2һ1/4(x/2һx/4һ2)=1/10(5xһ5(Xʮ3)/4)3/2һx/16ʮ1/2=1/10(15X/4һ15/4)2һX/16=3x/8һ3/819/8=7x/16x=38/7

֪ʶ㡿 AֵΪ12...nô|A|=12...n |A|=12...n= n AֵΪˣڵΪ A = ˦ ô (A²-A) = A² - A = ² - ˦ = (²-) A²-Aֵ...

վҳ | վͼ
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021
磬ַϵͷzhit325@qq.com