1+1⼀3-7⼀12+9⼀20-11⼀30+13⼀42-15⼀56+17⼀72=( )

2024-12-18 10:42:14
推荐回答(4个)
回答1:

原式=1+1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)
=10/9

回答2:

1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=1+1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)=1+1/9=10/9

回答3:

1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=(4)

回答4:

1+1/3-7/12+9/20-11/30+13/42-15/56+17/72=(10/9 )