Question

Tính bằng cánh thuận tiện nhất

a) 18 * 31 / 62 *36 =-----------------------=---------------------------

b) 25 * 84 / 100 *41= --------------------------=------------------------

Answer 1

\(a,\dfrac{18\times31}{62\times36}=\dfrac{18}{36}\times\dfrac{31}{62}=\dfrac{1}{2}\times\dfrac{1}{2}=\dfrac{1}{4}\\ b,\dfrac{25\times84}{100\times41}=\dfrac{25}{100}\times\dfrac{84}{41}=\dfrac{1}{4}\times\dfrac{84}{41}=\dfrac{21}{41}\)

Answer 2

a)

\(18.\dfrac{31}{62}.36\)

\(=9.36\)

\(=324\)

b)

\(25.\dfrac{84}{100}.41\)

\(=21.41\)

\(=861\)