观察下列各式,1⼀1*2=1-1⼀2 1⼀2*3=1⼀2-1⼀3,1⼀3*4=1⼀3-1⼀4

2024-11-20 06:30:08
推荐回答(3个)
回答1:

原式=1/1*2+1/2*3+…+1/11*12
=1-1/2+1/2-1/3+…+1/11-1/12
=1-1/12
=11/12

回答2:

=1/1*2+1/2*3+1/3*4+……+1/11*12
=1-1/2+1/2-1/3+1/3-1/4+……+1/11-1/12
=1-1/12
=11/12

回答3:

1-1/2+1/2-1/3+1/3-1/4+...+1/11-1/12=1-1/12=11/12