Question

[Nguyễn Thị Yến Nhi]

thực hiện phép tính sau

\(\left(\frac{151515}{60606}+\frac{151515}{121212}+\frac{151515}{202020}+\frac{151515}{303030}+\frac{151515}{424242}\right)\cdot\frac{28}{15}\)

Answer 1

[Đức Phạm]

\(\left(\frac{151515}{60606}+\frac{151515}{121212}+\frac{151515}{202020}+\frac{151515}{303030}+\frac{151515}{424242}\right)\times\frac{28}{15}\)

\(=\left(\frac{5}{2}+\frac{5}{4}+\frac{3}{4}+\frac{1}{2}+\frac{5}{14}\right)\times\frac{28}{15}\)

\(=\frac{75}{14}\times\frac{28}{15}\)

\(=10\)

Answer 2

[Công'ss Chúa'ss KN]

= ( 1/4 + 5/4 + 3/4 + 1/2 + 5/14) . 28/15
= [ 9/4 +( 7/14 + 5/14)] . 28/15
=        (9/4 + 6/7) . 28/15
= 87/28 . 28/15 = 87/15 = 29/5