(3X)÷3+4.5-(2.8-5X)÷0.2=0

化简：2|x| -3x÷|2x-|5x|| 21分之10x÷3分之2=7分之3x-3分之1x-2分之1x=190x-53x=7408.5x-6.9x=43.3x-200=0.2x+1101.02+0.4x+2.6x=3.428.9x-67=4.5x+656x-58=3x+1410x-20=5x+806x+5=10x-3420-1.4x=9.8x-288.2x+5.4x=272 (x^-3x+2/x^-5x+6)^2÷(x-1/x^2-2x-3)^2 化简：[(x+2)/(x^2-4)-(2x-5)/(x-4x+4)]÷[(x-3)/(x-2)] 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} 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 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x [x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简[x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简 化简：〔（x^2+18x+72)÷（x+12)-(x^2+5x-6)÷(x-1)〕·(x^3-2x^2-x+1) 16-x^2/x^2-2x-3÷1^2-5x+4/x-3 使代数式x+3/x-3÷x+5/x-4有意义的x的值 8x^2-4x/x^2-x-6÷(x-3/x+2-x+2/x-3),其中x=5 *-----------------------------------------------*| 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 || 计算：(1)/(x-3)÷(x+2)/(x^2-9)-(1)/(x^2+5x+6) 化简：x^2-5x+6/x^2-1÷x-3/x+1 (16x^4-5x³+3x²-6x)÷(-2x) (x^2-x-6)÷(x-3) 化简 [3x/(x+2)-x/(x=2)]÷x/(x^2-4)化简 [3x/(x+2)-x/(x-2)]÷x/(x^2-4