Question

thực hiện phép tính và cho kết quả:

A= 4/5 + (1/5 - 1/7) x 2/7

gấp lắm ạ

Answer 1

A= 4/5 + (1/5 - 1/7) x 2/7

A= 4/5 + 2/35 x 2/7

A= 4/5 +  4/245

A=40/49

Answer 2

A=4/5+(7/35-5/35)x2/7

=4/5+2/35*2*7

=4/5+4/245

=196/245+4/245

=200/245=40/49

Answer 3

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

\(A=\frac{4}{5}+\frac{2}{35}\times\frac{2}{7}\)

\(A=\frac{4}{5}+\frac{4}{245}\)

\(A=\frac{40}{49}\)

Answer 4

A=\(\frac{4}{5}\)+ \(\frac{2}{35}\)x\(\frac{2}{7}\)  

A=\(\frac{4}{5}\)+ \(\frac{4}{245}\)

A= \(\frac{40}{49}\)