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2x+1/8=11/8求解方程

解:2x+1/8=11/8 2x=11/8-1/8 2x=5/4 x=5/8

1.x+3/4=7/8 x=7/8-3/4 x=1/8 2.11/12-x=5/6 x=11/12-5/6 x=1/12 3.x-4/7=2 x=4/7+2 x=18/7

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+2y+z=8 (1) 2x+3y+z=11 (2) x+3y+3z=16 (3) (3)-(1),得 y+2z=8 2*(1)-(2),得 y+z=5 两个等式相减,z=3 所以y=2,x=1 方程组的解是 x1=1, x2=2, x3=3 .

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+11.2x9.9-11.2x1.2 =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...

"规律是1/2-1/5=3/(2*5) 1/5-1/8=3/(5*8) 1/8-1/11=3/(8*11) 看出规律没? 原式 =(1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17+1/17-1/20)/3 =(1/2-1/20)/3 =(10/20-1/20)/3 =3/20"

当1/2<x<2时 2-x+2x-1=8 x=7 不符题意 当x<1/2时 2-x+1-2x=8 -3x=5 x=-3/5 当x≥2时 x-2+2x-1=8 3x=11 x=3/11

解:(1) ;(2) 。

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