1-0.7+3x/0.8=0.3x-1/0.4-x

8x-5.5x=7.57.2x÷3.6=2 3x＋6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x＋x=1.8 3.2x＋1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x＋6x=4.5 18x-12x=5.42x-1.6x=3.6 18x＋3x=7×6 1.2x-0.5x=0.71.3x＋2.7x=1 4x-3.2x=6.4 0.8x＋3.2x＋3x=562.8x-2x=7.2 (5x+1/4)-(2x-1/6)=1-(3-x/12)怎么做?还有1-（0.7+3x/0.8)=(0.3x-1/0.4)-x (X+1)X(X+2)X(X+3)=504 1,（x+0.8)*2=2.4 2,7x / 4=12+x 3,0.3x-8*0.7=0.1x1,（x+0.8)*2=2.42,7x / 4=12+x3,0.3x-8*0.7=0.1x 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X 0.8x（3x+1）-0.3x（3x-2）=2 0.8*50x>0.7*50(x+4) 0.8*50x=0.7*50(x+4) 0.8*50x(1)0.8*50x>0.7*50(x+4)(2)0.8*50x=0.7*50(x+4)(3)0.8*50x 1-0.7+3x/0.8=0.3x-1/0.4-x 1-0.8分之0.7+3x=0.4分之0.3x-1-x 1-(0.7+3x）除以0.8=(0.3x-1)除以0.4-x帮帮 如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 3X-根号2=2X+1(精确到0.01) 11-X=10X 4X-3=2X-9 5+四分之1X=2分之1X-4 0.8X=0.7X-13X-根号2=2X+1(精确到0.01) 11-X=10X 4X-3=2X-9 5+四分之1X=2分之1X-4 0.8X=0.7X-1 解方程 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x(x-2)-2x(x+1)-3x(x-5) 其中x=负½ x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x 请问这道题咋做 ：（x）X (x+1) X (x+2) X (x+3) =360