1又(1/4)-(9/20)+(11/30)-(13/42)+(15/56)-(17/72)+(19/90)等于几
问题描述:
1又(1/4)-(9/20)+(11/30)-(13/42)+(15/56)-(17/72)+(19/90)等于几
答
1又(1/4)-(9/20)+(11/30)-(13/42)+(15/56)-(17/72)+(19/90)=1又1/10