小学6年简算

=2/7-1/7+2/5

=1/7+2/5

=19/35

3.14×2.3+3.14×3.7

=3.14×(2.3+3.7)

=3.14×6

=18.84

12.5×(6.1+0.26)×8

=(12.5×8)×6.36

=100×6.36

=636

14/15×1/4+1/15÷4

=14/15×1/4+1/15×1/4

=(14/15+1/15)×1/4

=1×1/4

=1/4

930÷[1/2×(2/5+4/5)]

=930÷[1/2×6/5]

=930÷3/5

=1550

3 2/5×99+3.4

=3.4×99+3.4

=3.4×(99+1)

=3.4×100

=340