5/12[-3/4(x-y)^3]*(x+y)^2*(-x-y)^3*5/6(y-x)^2_数学解答

5/12[-3/4(x-y)^3]*(x+y)^2*(-x-y)^3*5/6(y-x)^2

人气：182 ℃　时间：2020-05-13 11:47:28

解答

原式=4a(a+1)/a(a+2)-a(a-4)/(a+2)2
=4(a+1)/(a+2)-a(a-4)/(a+2)2
=(4a+4)(a+2)-a(a-4)]/(a+2)2
=(3a2+16a+8)/(a+2)2