Simple calculation for Grade 6 of primary school （1）3/5+2/5÷4/5+1/5 （2）1-1/3÷3/5-1/9 （3）（1/6+1/4）×8+2/3 （4）5/9-4/9÷8/9+1/9 （5）1/4+（1/18+1/8）×6 （6）（1/6+2/9）÷2/3+3/4

Simple calculation for Grade 6 of primary school （1）3/5+2/5÷4/5+1/5 （2）1-1/3÷3/5-1/9 （3）（1/6+1/4）×8+2/3 （4）5/9-4/9÷8/9+1/9 （5）1/4+（1/18+1/8）×6 （6）（1/6+2/9）÷2/3+3/4

(1)=(3+1)/5+1/2=9/10
(2)=1-5/9-1/9=1/3
(3)=(4+6)/24*8+2/3=(10+2)/3=4
(4)=(5+1)/9-1/2=2/3-1/2=1/6
(5)=1/4+1/8*6+1/18*6=1+1/3=4/3
(6)=1/6*(3/2)+2/9*(3/2)+3/4=1/4+3/4+1/3=4/3

1. How to calculate 2 / 3 - 5 / 6 × 3 / 10 + 3 / 22, 7 / 4 △ (2 / 3 + 1 / 2) × 4 / 5?

2/3-5/6×3/10+3/2
=2/3-1/4+3/2
=48/12-3/12+18/12
=21/4
7/4÷(2/3+1/2)×4/5
=(7/4×4/5)÷(2/3+1/2)
=7/5÷(4/6+3/6)
=7/5÷7/6
=7/5×6/7
=6/5