把题表示清楚
是x^2-1/x^2+6x+9除以(x-1)*(x+3)(x+4)/(x+1)
还是(x^2-1)/(x^2+6x+9)除以(x-1)*(x+3)(x+4)/(x+1)
(x-1)(x+1)/(x+3)²×1/(x-1)*(x+3)(x+4)/(x+1)=(x+4)/(x+3)
-3a^2b/3cd^2*8a^2c^2/21bd^2除以-2c/7a =a^5/3d^4
把题表示清楚
是x^2-1/x^2+6x+9除以(x-1)*(x+3)(x+4)/(x+1)
还是(x^2-1)/(x^2+6x+9)除以(x-1)*(x+3)(x+4)/(x+1)
(x-1)(x+1)/(x+3)²×1/(x-1)*(x+3)(x+4)/(x+1)=(x+4)/(x+3)
-3a^2b/3cd^2*8a^2c^2/21bd^2除以-2c/7a =a^5/3d^4