Question

Giúp mình với :

1.Tính

a, \(\dfrac{9}{5}-\dfrac{5}{9}\)

b, \(\dfrac{7}{2}+\dfrac{4}{5}+\dfrac{3}{6}\)

c, \(\left(\dfrac{5}{6}-\dfrac{4}{24}\right)+\dfrac{1}{3}\)

d,\(\left(\dfrac{9}{12}-\dfrac{10}{20}\right)-\dfrac{1}{8}\)

Answer 1

a,9/5-5/9=81/45-25/45 =56/45 b,7/2+4/5+3/6=105/30+24/30+15/30

=144/30=24/5

c,(5/6-4/24)+1/3=(20/24-4/24)+1/3

=2/3+1/3=1

d,(9/12-10/12)-1/8=-1/12-1/8

=-2/12-3/24

=-5/24

Answer 2

bấm máy đi là ra!

Answer 3

b)

\(\dfrac{7}{2}+\dfrac{4}{5}+\dfrac{3}{6}\\=\dfrac{7}{2}+\dfrac{4}{5}+\dfrac{1}{2}\\= \left(\dfrac{7}{2}+\dfrac{1}{2}\right)+\dfrac{4}{5}\\ =4+\dfrac{4}{5}\\=\dfrac{20}{5}+\dfrac{4}{5}\\ =\dfrac{24}{5} \)

mk lm rùi đó! nhớ tick mk nha! Chúc bn hk tốt!