Phân số gạo tẻ so với :

\(\dfrac{2}{3}:\dfrac{1}{4}=\dfrac{2}{3}x\dfrac{4}{1}=\dfrac{8}{3}\left(gạo.nếp\right)\)

Hiệu số phần bằng nhau :

\(8-3=5\left(phần\right)\)

Số kg gạo tẻ :

\(250:5x8=400\left(kg\right)\)

Số kg gạo nếp :

\(400-250=150\left(kg\right)\)

Đáp số...

Ai thấy bài ko hay có thể nói nhé, mik sẽ sửa@

hay

Mỗi đơn thức được coi là một đa thức 

Vậy 4\(xy^3\) là một đa thức là đúng em nhá 

\(\dfrac{11}{16}\) = \(\dfrac{1}{16}\) + \(\dfrac{10}{16}\) = \(\dfrac{1}{16}\) + \(\dfrac{2+8}{2\times8}\) = \(\dfrac{1}{16}\) + \(\dfrac{2}{2\times8}\) + \(\dfrac{8}{2\times8}\) = \(\dfrac{1}{16}\) + \(\dfrac{1}{8}\)+ \(\dfrac{1}{2}\)

\(\dfrac{5}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{4}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{4}{3\times4}\) = \(\dfrac{1}{12}\) + \(\dfrac{1}{3}\)

\(\dfrac{14}{21}=\dfrac{14:7}{21:7}=\dfrac{2}{3}=\dfrac{1}{3}+\dfrac{1}{3}\)

\(\dfrac{15}{29}=\dfrac{1+14}{29}=\dfrac{1}{29}+\dfrac{14}{29}\)

\(\dfrac{9}{35}=\dfrac{1+8}{35}=\dfrac{1}{35}+\dfrac{8}{35}\)

\(\dfrac{16}{27}=\dfrac{2+14}{27}=\dfrac{2}{27}+\dfrac{14}{27}\)

thank

Đổi: 2 tấn = 2000kg

a) Số gạo nếp là:

\(20\%\times2000=400\left(kg\right)\)

b) Số gạo nếp là:

\(25\%\times2000=500\left(kg\right)\)

A,Số gạo nếp là:400

B,số gạo nếp là:500

\(\dfrac{x}{2}-\left(\dfrac{3x}{5}-\dfrac{13}{5}\right)=\dfrac{7}{5}+\dfrac{7}{10}x\\ \Rightarrow\dfrac{x}{2}-\dfrac{3x}{5}+\dfrac{13}{5}=\dfrac{7}{5}+\dfrac{7x}{10}\\ \Rightarrow\dfrac{5x}{10}-\dfrac{6x}{10}+\dfrac{26}{10}=\dfrac{14}{10}+\dfrac{7x}{10}\\ \Rightarrow\dfrac{5x}{10}-\dfrac{6x}{10}-\dfrac{7x}{10}=\dfrac{14}{10}-\dfrac{26}{10}\\ \Rightarrow\dfrac{-8x}{10}=-\dfrac{12}{10}\\ \Rightarrow\dfrac{-4x}{5}=-\dfrac{6}{5}\\ \Rightarrow-20x=-30\\ \Rightarrow x=\dfrac{3}{2}\)

\(5\dfrac{3}{4}=2\dfrac{1}{2}+3\dfrac{1}{x}\\ \dfrac{23}{4}=\dfrac{5}{2}+3\dfrac{1}{x}\\ 3\dfrac{1}{x}=\dfrac{23}{4}-\dfrac{5}{2}\\ 3\dfrac{1}{x}=\dfrac{23}{4}-\dfrac{10}{4}\\ 3\dfrac{1}{x}=\dfrac{13}{4}\\ \Rightarrow x=4\)

15/7 : 1/2 + 3/14 : 1/2

= 15/7 . 2 + 3/14 . 2

= (15 + 3/14) . 2

= 213/14 . 2

= 213/7

\(\dfrac{15}{7}\) : \(\dfrac{1}{2}\) + \(\dfrac{3}{14}\) : \(\dfrac{1}{2}\)

= (\(\dfrac{15}{7}\)  + \(\dfrac{3}{14}\)) : \(\dfrac{1}{2}\)

= (\(\dfrac{15\times2}{7\times2}\) + \(\dfrac{3}{14}\)) : \(\dfrac{1}{2}\)

 = (\(\dfrac{30}{14}\) + \(\dfrac{3}{14}\)) \(\times\) 2

 = \(\dfrac{33}{14}\) \(\times\) 2

=    \(\dfrac{33}{7}\)