Question

[Hoodie Wolf]

Gíup mk với

Answer 1

[Nguyễn Lê Phước Thịnh]

Bài 2:

Chiều dài hình chữ nhật là \(2-\dfrac{3}{4}=\dfrac{8}{4}-\dfrac{3}{4}=\dfrac{5}{4}\left(m\right)\)

Diện tích hình chữ nhật là \(\dfrac{3}{4}\times\dfrac{5}{4}=\dfrac{15}{16}\left(m^2\right)\)

Bài 1:

a: \(\dfrac{3}{5}\times\dfrac{12}{48}+\dfrac{3}{5}\times\dfrac{12}{24}+\dfrac{3}{5}\)

\(=\dfrac{3}{5}\left(\dfrac{12}{48}+\dfrac{12}{24}+1\right)\)

\(=\dfrac{3}{5}\left(\dfrac{1}{4}+\dfrac{1}{2}+1\right)\)

\(=\dfrac{3}{5}\left(\dfrac{1}{4}+\dfrac{2}{4}+\dfrac{4}{4}\right)=\dfrac{3}{5}\times\dfrac{7}{4}=\dfrac{21}{20}\)

b: \(\dfrac{2}{9}+\dfrac{13}{17}+\dfrac{5}{11}+\dfrac{4}{17}+\dfrac{7}{9}+\dfrac{6}{12}+\dfrac{6}{11}\)

\(=\left(\dfrac{2}{9}+\dfrac{7}{9}\right)+\left(\dfrac{13}{17}+\dfrac{4}{17}\right)+\left(\dfrac{5}{11}+\dfrac{6}{11}\right)+\dfrac{1}{2}\)

\(=1+1+1+\dfrac{1}{2}=\dfrac{7}{2}\)