How to calculate, Exercise 3 in Volume 1 Textbook of grade 6 of primary school
=1/2*(1/15+1/3)
=1/2*2/5
=1/5
Half is usually represented by 1 / 2, not 2 / 1
A simple algorithm of 7 / 8 times 6 / 5 plus 1 / 8 divided by 6 / 5
7 out of 8 times 6 out of 5 plus 1 out of 8 / 6 out of 5
=7 out of 8 times 6 out of 5 plus 1 out of 8 × 5 out of 6
=1/8×(42/5+5/6)
=1/8×277/30
=277/240
A simple algorithm of 1 / 6 multiplied by 3 / 8 divided by 11 / 6
1 / 6 divided by 11 / 6 multiplied by 3 / 8
Simple algorithm of 1.9 * 4.5-0.45
=(19+1)*0.45=20*0.45=9