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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

2һ5x3.4=10.6 ⣺2X-17=10.6 2X=27.6 X=27.62 X=13.8

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

⣺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...

Եȣ֣Щ׺Ҫ

ϣа

ÿ𿪣 ԭ=1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 .... - 1/7 =6/7

/ʾʲô

(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...

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