Question

Tính nhanh

A = 3/4 + 2/7 + 1/4 + 3/5 + 5/7

 

Answer 1

\(A=\frac{3}{4}+\frac{2}{7}+\frac{1}{4}+\frac{3}{5}+\frac{5}{7}\)

\(A=\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{2}{7}+\frac{5}{7}\right)+\frac{3}{5}\)

\(A=1+1+\frac{3}{5}\)

\(A=\frac{5}{5}+\frac{5}{5}+\frac{3}{5}\)

\(A=\frac{13}{5}\)

Answer 2

A=(3/4+1/4)+(2/+5/7)+3/5

A= 1+1+3/5

A=13/5

Answer 3

A = ( 3/4 + 1/4 ) + ( 2/7 + 5/7 ) + 3/5

A = 5/4 + 1 + 3/5

A = 25/20 + 1 + 12/20

A = 37/20 + 1

A = 1 và 37/20

Answer 4

👍👍👍

Answer 5

=   ( 3/4 + 1/4 ) + ( 2/7 + 5/7 ) + 3/5

= 1 + 1 + 3/5

= 2 + 3/5

=1