Question

Bài Tính bằng cách thuận tiện nhất nha

a)13/19+18/19+17/19

b)3/5+3/16+13/16

Answer 1

\(a,\dfrac{13}{19}+\dfrac{18}{19}+\dfrac{17}{19}=\dfrac{13+18+17}{19}=\dfrac{48}{19}\\ b,\dfrac{3}{5}+\dfrac{3}{16}+\dfrac{13}{16}=\dfrac{3}{5}+\left(\dfrac{3}{16}+\dfrac{13}{16}\right)=\dfrac{3}{5}+\dfrac{16}{16}=\dfrac{3}{5}+1=\dfrac{3}{5}+\dfrac{5}{5}=\dfrac{8}{5}\)

Answer 2

\(a\dfrac{13+18+17}{19}=\dfrac{48}{19}\)

\(b\dfrac{3}{5}+\dfrac{3+13}{16}=\dfrac{3}{5}+1=\dfrac{3}{5}+\dfrac{5}{5}=\dfrac{8}{5}\)

Answer 3

a) 13/19 + 18/19 + 17/19

= (13/19 + 17/19) + 18/19

= 30/19 + 18/19

= 48/19

b) 3/5 + 3/16 + 13/16

= 3/5 + (3/16 + 13/16)

= 3/5 + 1

8/5

Answer 4

8/5

Answer 5

\(a,\dfrac{13}{19}+\dfrac{18}{19}+\dfrac{17}{19}\)

\(=\dfrac{31}{19}+\dfrac{17}{19}\)

\(=\dfrac{48}{19}\)