Question

giúp mình giải mấy pháp toán:
a) 4/5 - 3/8 + 1/4
b) 5/9 + 2/3 - 1/2
c) 5/12 + 3/4 + 1/3
d) 1/4 + 3/7 + 11/14

Answer 1

a: =4/5-3/8+2/8

=4/5-1/8

=32/40-5/40=27/40

b: =5/9+6/9-1/2

=11/9-1/2

=22/18-9/18=13/18

c: =5/12+9/12+4/12=18/12=3/2

d: =7/28+12/28+22/28=41/28