3-m 2m-4÷(m+2-5 m-2);
问题描述:
3-m 2m-4÷(m+2-5 m-2);
3-m/2m-4÷(m+2-5/m-2);
/是分数线,
答
(3-m)/(2m-4)÷[m+2-5/(m-2)] =(3-m)/(2m-4)÷[(m^2-4-5)/(m-2)] =(3-m)/(2m-4)÷[(m^2-9)/(m-2)] =(3-m)/(2m-4)÷[(m-3)(m+3)/(m-2)] =(3-m)/(2m-4)*(m-2)/(m-3)(m+3) =-(m-3)/2(m-2)*(m-2)/(m-3)(...