孝感甜点加盟:计算(a+b)÷(a-b)+(2b+1)÷(b-a)

来源:百度文库 编辑:高考问答 时间:2024/05/01 10:11:55

(a+b)÷(a-b)+(2b+1)÷(b-a)
=(a+b)/(a-b)-(2b+1)/(a-b)
=(a+b-2b-1)/(a-b)
=(a-b-1)/(a-b)

(a+b)÷(a-b)+(2b+1)÷(b-a)
=(a+b)/(a-b)-(2b+1)/(a-b)
=(a+b-2b-1)/(a-b)
=(a-b-1)/(a-b)
= 1-1/(a-b)
就是1减(a-b)分之1

(a+b)/(a-b)-(2b+1)/(a-b)
=a-b-1/a-b
=1-1/a-b

原式=(a+b)/(a-b)+(2b+1)/[-(a-b)]
=1/(a-b)[(a+b)-(2b+1)]
=1/(a-b)[a+b-2b-1]
=1/(a-b)[a-b-1]
=1/(a-b)[(a-b)-1]
=1-1/(a-b)

1-1/a-b

1-1/a-b