小学六年级简单计算

1.(1/69+2/71)乘以23+25除以71。

=1/69*23+2/71*23+25/71

=1/3+(46/71+25/71)

=1/3+1

=4/3

2.(1+1/2)次(1-1/2)次(1+1/3)次(1-1/3)

=3/2*1/2*4/3*2/3...*10/9*8/9

=1/2*10/9(邀请所有中间的)

=5/9

3.1/2乘以3+1/3乘以4+...+1/19乘以20

=1/2-1/3+1/3-1/4+...+1/19-1/20

=1/2-1/20

=9/20

4.1/27+505/2727+131313/272727

=1/27+5*101/(27*101)+13*10101/(27*10101)

=1/27+5/27+13/27

=19/27

5.100-98+96-94+....+4-2

=(100-98)+(96-94)+...(4-2)

=2+2+...+2(***有25)

=2*25

=50