7x÷9=7.

x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 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-2/(x^2-9)(1+(2x-7/x^2-4x+4)÷(x+1)/(x+3)其中x=2010 (x+7/x+6) +(x+9/x+8)=9x=(x+10/x+9) +(x+6/x+5) 9x+7x-x=4.5 x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 当x=9/2时,求(x^2+7x+10)/(x^2+6x+5)×(x^3+1)/(x^2+4x+4)÷(x^2-x+1)/(x+2) 0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6（x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5）÷3=1.7 x=5（x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x= (x+1)/(x+2)+(x+8)/(x+9)解答x+1/x+2+x+8/x+9=x+2/x+3+x+7/x+8 X÷(X-9)=3.25 (X-7)÷(45-X)=1 5x÷8-3x=40 7x-8=42+3x 9x+7-3x=9x-3 7x÷9=7. 9x+27=812.5x-12=460.5X(7x+28x)=14.7(4x-4.8)÷4=12442.2X2-5.8x=32.2 4x-7x=9-5x x=? x-3(20-x)=3x-7(9-x)