Вычислите: а) 1/2+2/5, б) 1/2-2/5, в)1/4+1/6, г) 9/10-5/6

Question

Вычислите: а) 1/2+2/5, б) 1/2-2/5, в)1/4+1/6, г) 9/10-5/6

Answer 1

1) 1/2 + 2/5 = 5/10 + 4/10 = 9/10
2) 1/2 - 2/5 = 5/10 - 4/10 = 1/10
3) 1/4 + 1/6 = 3/12 + 2/12 = 5/12
4) 9/10 - 5/6 = 27/30 - 25/30 = 2/30 = 1/15

Answer 2

1/2+2/5=5+4/10=9/10=0,9
1/2-2/5=5-4/10=1/10=-0,1
1/4+1/6=3+2/12=5/12=0,25
9/10-5/6=27-25/30=2/30=0,0(6)