Phân số thứ ba là

\(\dfrac{23}{12}-\dfrac{7}{6}=\dfrac{3}{4}\)

Phân số thứ hai là

\(\dfrac{17}{12}-\dfrac{3}{4}=\dfrac{2}{3}\)

Phân số thứ nhất là

\(\dfrac{7}{6}-\dfrac{2}{3}=\dfrac{1}{2}\)

Phân số thứ 3 là :

\(\dfrac{23}{12}-\dfrac{7}{6}=\dfrac{23}{12}-\dfrac{14}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)

Phân số thứ 2 là :

\(\dfrac{17}{12}-\dfrac{9}{12}=\dfrac{12}{12}=1\)

Phân số thứ 1 là :

\(\dfrac{7}{6}-1=\dfrac{7}{6}-\dfrac{6}{6}=\dfrac{1}{6}\)

s<2/3

\(5^{2x-3}-2.5^2=5^2.3\)

\(5^{2x-3}=2.5^2+5^2.3\)

\(2x-3=3\)

\(2x=3+3\)

\(2x=6\)

\(x=6:2=3\)

\(\Rightarrow x=3\)

a) \(y\times15+y\times13=560\times45\)

\(y\times\left(15+13\right)=25200\)

\(y\times28=25200\)

\(y=25200:28\)

\(y=900\)

b) \(y\times345-y\times44-y=123600\)

\(y\times\left(345-44-1\right)=123600\)

\(y\times300=123600\)

\(y=123600:300\)

\(y=412\)

980 + y : 94 = 8245

         y : 94 = 8245 - 980

         y : 94 = 7265

         y       = 7265 x 94

         y       = 682910

45 x y x 36 = 3240

45 x y        = 3240 : 36

45 x y        = 90

       y         = 90 : 45

       y         = 2

3865 - y + 875 = 1000

3865 - y          = 1000 - 875

3865 - y          = 125

           y          = 3865 - 125

           y          = 3740

4788 : 126 x y = 1596

   38          x y = 1596

                   y = 1596 : 38

                   y = 42

24624 : y : 9 = 76

24624 : y      = 76 x 9

24624 : y      = 684

            y      = 24624 : 684

            y      = 36

 Tick cho mik nha.

a) \(980+y:94=8245\)

\(y:94=7265\)

\(y=7265\times94\)

\(y=682910\)

b) \(45\times y\times36=3240\)

\(45\times y=3240:36\)

\(45\times y=90\)

\(y=90:45\)

\(y=2\)

c) \(3865-y+875=1000\)

\(3865-y=125\)

\(y=3865-125\)

\(y=3740\)

d) \(4788:126\times y=1596\)

\(126\times y=4788:1596\)

\(126\times y=3\)

\(y=\dfrac{3}{126}\)

\(y=\dfrac{1}{42}\)

e) \(24624:y:9=76\)

\(y:9=24624:76\)

\(y:9=324\)

\(y=324\times9\)

\(y=2916\)

a) \(\dfrac{3}{5}\) của 105kg = 63 kg

345 giây = 5 phút 45 giây

980087 dag = 980 tạ 87 dag

b) \(\dfrac{3}{4}ha\dfrac{1}{5}dam^2\) = 7520 \(m^2\)

40087 \(dm^2\) = 400 \(m^2\) 8700 \(cm^2\)

\(\dfrac{2}{3}\) giờ 29 phút = 4140 giây

a) \(\dfrac{1}{2}:y\times\dfrac{3}{5}=\dfrac{4}{3}+\dfrac{3}{4}\)

\(\dfrac{1}{2}:y\times\dfrac{3}{5}=\dfrac{25}{12}\)

\(\dfrac{1}{2}:y=\dfrac{25}{12}:\dfrac{3}{5}\)

\(\dfrac{1}{2}:y=\dfrac{125}{36}\)

\(y=\dfrac{1}{2}:\dfrac{125}{36}\)

\(y=\dfrac{18}{125}\)

b) \(\dfrac{4}{3}-\dfrac{1}{2}\times y=1\)

\(\dfrac{1}{2}\times y=\dfrac{4}{3}-1\)

\(\dfrac{1}{2}\times y=\dfrac{1}{3}\)

\(y=\dfrac{1}{3}:\dfrac{1}{2}\)

\(y=\dfrac{2}{3}\)

c) \(\dfrac{1}{4}+y:\dfrac{1}{3}=\dfrac{5}{6}\)

\(y:\dfrac{1}{3}=\dfrac{5}{6}-\dfrac{1}{4}\)

\(y:\dfrac{1}{3}=\dfrac{7}{12}\)

\(y=\dfrac{7}{12}\cdot\dfrac{1}{3}\)

\(y=\dfrac{7}{36}\)

a) \(\dfrac{4}{5}\cdot\dfrac{5}{8}:\dfrac{4}{5}=\left(\dfrac{4}{5}:\dfrac{4}{5}\right)\cdot\dfrac{5}{8}=1\cdot\dfrac{5}{8}=\dfrac{5}{8}\)

b) \(\dfrac{5}{6}+\left(\dfrac{1}{2}:\dfrac{3}{2}+\dfrac{4}{5}\right)=\dfrac{5}{6}+\left(\dfrac{1}{2}\cdot\dfrac{2}{3}+\dfrac{4}{5}\right)=\dfrac{5}{6}+\left(\dfrac{1}{3}+\dfrac{4}{5}\right)=\dfrac{17}{15}+\dfrac{5}{6}=\dfrac{59}{30}\)

nhà lan có số quả trứng là:9x2=18

dễ như ăn kẹo

18