Toán bài 1 tính bằng cách hợp lí a.3/4+12/18+20/45+16/48+45/81+25/100= 01/12/2021 By Valentina bài 1 tính bằng cách hợp lí a.3/4+12/18+20/45+16/48+45/81+25/100=
$\dfrac{3}{4} + \dfrac{12}{18} + \dfrac{20}{45} + \dfrac{16}{48} + \dfrac{45}{81} + \dfrac{25}{100}$ $= \dfrac{3}{4} + \dfrac{2}{3} + \dfrac{4}{9} + \dfrac{1}{3} + \dfrac{5}{9} + \dfrac{1}{4}$ $= (\dfrac{3}{4}+ \dfrac{1}{4}) + (\dfrac{2}{3} + \dfrac{1}{3} ) + (\dfrac{4}{9} + \dfrac{5}{9})$ $= 1 + 1 + 1$ $= 3$ Trả lời
a/ 3/4 + 12/18 + 20/45 + 16/48 + 45/81 + 25/100 = 3/4 + 2/3 + 4/9 + 1/3 + 5/9 + 1/4 = (3/4 + 1/4) + (2/3 + 1/3) + (4/9 + 5/9) = 1 + 1 + 1 = 3 Trả lời
$\dfrac{3}{4} + \dfrac{12}{18} + \dfrac{20}{45} + \dfrac{16}{48} + \dfrac{45}{81} + \dfrac{25}{100}$
$= \dfrac{3}{4} + \dfrac{2}{3} + \dfrac{4}{9} + \dfrac{1}{3} + \dfrac{5}{9} + \dfrac{1}{4}$
$= (\dfrac{3}{4}+ \dfrac{1}{4}) + (\dfrac{2}{3} + \dfrac{1}{3} ) + (\dfrac{4}{9} + \dfrac{5}{9})$
$= 1 + 1 + 1$
$= 3$
a/ 3/4 + 12/18 + 20/45 + 16/48 + 45/81 + 25/100
= 3/4 + 2/3 + 4/9 + 1/3 + 5/9 + 1/4
= (3/4 + 1/4) + (2/3 + 1/3) + (4/9 + 5/9)
= 1 + 1 + 1
= 3