hông biết nữa ¿
Câu 1
a) \(\dfrac{7}{9}+\dfrac{3}{9}\)
\(=\dfrac{10}{9}\)
b) \(\dfrac{2}{3}-\dfrac{3}{8}\)
\(=\dfrac{16}{24}-\dfrac{9}{24}\)
\(=\dfrac{7}{24}\)
c) \(\dfrac{4}{5}\times3\)
\(=\dfrac{4\times3}{5}\)
\(=\dfrac{12}{5}\)
d) \(\dfrac{10}{13}\div\dfrac{3}{4}\)
\(=\dfrac{10}{13}\times\dfrac{4}{3}\)
\(=\dfrac{40}{39}\)
Câu 2
\(x-\dfrac{3}{4}=\dfrac{1}{2}\)
\(x=\dfrac{1}{2}+\dfrac{3}{4}\)
\(x=\dfrac{5}{4}\)
a) 10/9
b)2/3 - 3/8
= 16/24 - 9/24
= 3/24=1/8
c)4/5 x 3
=\(\dfrac{12}{5}\)
d)10/13 : 3/4
= \(\dfrac{10}{13}x\dfrac{4}{3}\)
= \(\dfrac{40}{39}\)
nhớ tick cho tui nha
câu 2:
x - \(\dfrac{3}{4}\)= \(\dfrac{1}{2}\)
x = 1/2 + 3/4
x = 5/4
