Question

计算题：x^2+4x+4分之x^2-1除以(x+1)*x-1分之x^2+3x+2 9点之前要.

Answer 1

原式=(x+1)(x-1)/(x+2)²*1/(x+1)*(x+1)(x+2)/(x-1)

=(x-1)/(x+2)²*(x+1)(x+2)/(x-1)

=(x+1)/(x+2)