Question

\(\frac{1}{3}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)

Answer 1

ai tra loi DUNG cho 5

Answer 2

1/3+1/12+1/20+1/30+1/42=11/21

Answer 3

1/3 + 1/12 + 1/20 + 1/30 + 1/42 = 11/21

Answer 4

MC: 420

thua so phu tuong ung 

420:3=140

420:12=35

420:20=21

420: 30=14

420:42=10

quy dong

1/3=140/420

1/12=35/420

1/20=21/420

1/30=14/420

1/42=10/420

Vay 1/3 + 1/12+ 1/20 + 1/30 + 1/42

= 140/420 + 35/420 + 21/420 + 14/420 + 10/420

=175/420 + 21/420 + 14/420 + 10/420

=196/420 + 14/420 + 10/420

=210/420 + 10/420

=220/420

=11/21