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2x+1/8=11/8求解方程

(1)2x+8=11.26, 2x+8-8=11.26-8, 2x=3.26, 2x÷2=3.26÷2, x=1.63;(2)x-1.2=9.3, x-1.2+1.2=9.3+1.2, x=10.5;(3)5x+8=22, 5x+8-8=22-8, 5x=14, 5x÷5=14÷5, x=2.8;(4)1.2x+0.56=2,1.2x+0.56-0.56=2-0.56, 1.2x=1.44, 1.2x÷...

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

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

题目是2X=8?解:2X=8 X=4。 6X+1=6 x 4 + 1=25。 5X+11=5 x 4 +11=31。

增广矩阵 = 4 2 -1 2 3 -1 2 10 11 3 0 8 r2+2r1 4 2 -1 2 11 3 0 14 11 3 0 8 r3-r2 4 2 -1 2 11 3 0 14 0 0 0 -6 所以 r(A)=2≠3=r(A,b) 故方程组无解.

"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"

(1/2×11/18+8/9)×2/3 =(11/36+8/9)×2/3 =43/36×2/3 =43/54

(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...

解: 增广矩阵= 2 -3 5 7 1 4 -6 2 3 2 2 -3 -11 -15 1 r2-2r1,r3-r1 2 -3 5 7 1 0 0 -8 -11 0 0 0 -16 -22 0 r3-2r2,r2*(-1/8),r1-5r2 2 -3 0 1/8 1 0 0 1 11/8 0 0 0 0 0 0 r1*(1/2) 1 -3/2 0 1/8 1/2 0 0 1 11/8 0 0 0 0 0 0 方程组的通解为: ...

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