Question

TINH GIA TRI CUA BIEU THUC:

( 3/20 + 1/2 - 1/15) X   12/49 

3.1/3 + 2/9

Answer 1

(3/20 + 1/2 - 1/5 ) X 12/49 = 1/7

3.1/3 + 2/9 = 11/9

Answer 2

\(\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{15}\right).\frac{12}{49}\)

\(=\left(\frac{9}{60}+\frac{30}{60}-\frac{4}{60}\right).\frac{12}{49}\)

\(=\frac{35}{60}.\frac{12}{49}\)

\(=\frac{1}{7}\)