a, 1\(\dfrac{2}{3}\) tấn = \(\dfrac{5}{3}\) tấn = \(\dfrac{50}{3}\) tạ = \(\dfrac{200}{12}\) tạ

    10\(\dfrac{3}{4}\) tạ  = \(\dfrac{43}{4}\) tạ  = \(\dfrac{129}{12}\)tạ < \(\dfrac{200}{12}\) tạ 

    1\(\dfrac{2}{3}\) tấn < 10\(\dfrac{3}{4}\) tạ (S)

b, 1\(\dfrac{3}{4}\) tấn  = 10 và \(\dfrac{30}{4}\) tạ > 10 và \(\dfrac{3}{4}\) tạ

 Vậy  1\(\dfrac{3}{4}\) tấn > 10 và \(\dfrac{3}{4}\)tạ (Đ)

c, 1\(\dfrac{3}{4}\) tấn = 10 và \(\dfrac{3}{4}\) tạ (S) 

em cảm ơn cô ạ!

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

\(\dfrac{45\times16-17}{45\times15+28}\)

\(=\dfrac{45\times\left(15+1\right)-17}{45\times15+28}\)

\(=\dfrac{45\times15+45-17}{45\times15+28}\)

\(=\dfrac{45\times15+28}{45\times15+28}\)

\(=1\)

\(\dfrac{10}{11}:\left(\dfrac{2}{3\times5}+\dfrac{2}{5\times7}+\dfrac{2}{7\times9}+\dfrac{2}{9\times11}\right)\)

\(=\dfrac{10}{11}:\left(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}\right)\)

\(=\dfrac{10}{11}:\left(\dfrac{1}{3}-\dfrac{1}{11}\right)\)

\(=\dfrac{10}{11}:\dfrac{8}{33}\)

\(=\dfrac{10}{11}\times\dfrac{33}{8}\)

\(=5\times\dfrac{3}{4}\)

\(=\dfrac{15}{4}\)

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

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

=    \(\dfrac{33}{7}\)

Số kg gạo ngày thứ 2 xuất đi :

\(4676x\dfrac{6}{7}=4008\left(kg.gạo\right)\)

Số kg gạo luasc đầu trong kho có :

\(4676+4008+15365=24049\left(kg.gạo\right)\)

Đáp số...

Số gạo ngày thứ hai xuất kho:

4676 × 6/7 = 4008 (kg)

Số gạo trong kho lúc đầu:

4676 + 4008 + 15365 = 24049 (kg)

a) \(\dfrac{9}{6}-\dfrac{4}{12}x\dfrac{7}{8}\)

\(=\dfrac{3}{2}-\dfrac{1}{3}x\dfrac{7}{8}\)

\(=\dfrac{3}{2}-\dfrac{7}{24}\)

\(=\dfrac{36}{24}-\dfrac{7}{24}\)

\(=\dfrac{29}{24}\)

b) \(\dfrac{1}{5}:6+\dfrac{1}{5}\)

\(=\dfrac{1}{5}x\dfrac{1}{6}+\dfrac{1}{5}\)

\(=\dfrac{1}{30}+\dfrac{1}{5}\)

\(=\dfrac{1}{30}+\dfrac{6}{30}=\dfrac{7}{30}\)

a=29/4
b=7/30
nha

 297/110

\(\dfrac{25x8+25x9+25-25x5}{99+98+97+96}\)

\(=\dfrac{25x\left(8+9+1-5\right)}{390}\)

\(=\dfrac{25x13}{390}\)

\(=\dfrac{25x13}{13x30}\)

\(=\dfrac{5}{6}\)

đc p/s 27/10 nha 
rút gọn p/s đó cho 11

297/110 = (297 : 11)/(110 : 11)

= 27/10