https://olm.vn/hoi-dap/detail/8320550663540.html

mk đã trl rồi .

1. is cooking and is watching

2. brushes

3. are playing

4. is listening

5. listens

Vì M nằm giữa và OM = 1/2 ON nên M là trung điểm của ON.

\(\Rightarrow\) Độ dài MN là 3 cm

mà 3 cm = 3cm nên MN = OM

Vậy MN = OM.

a,\(\dfrac{4}{15}< \dfrac{5}{16}\)

b,\(\dfrac{2}{113}< \dfrac{4}{115}\)

c,\(\dfrac{2}{7}< \dfrac{4}{9}\)

d,\(\dfrac{4}{7}>\dfrac{2}{5}\)

Ta có :\(83\) và \(91,97\)

a, \(\dfrac{32}{40}=\dfrac{32x2,5}{40x2,5}=\dfrac{80}{100}\)

b, \(\dfrac{15}{20}=\dfrac{15x5}{20x5}=\dfrac{75}{100}\)

c, \(\dfrac{13}{125}=\dfrac{13x8}{125x8}=\dfrac{104}{1000}\)

\(\Rightarrow x\in BC\left(24,36\right)\)

Ta có: \(24=2^3.3\\ 36=2^2.3^2\)

\(\Rightarrow x\in BCNN\left(24,36\right)=2^3.3^2=72\\ \Rightarrow B\left(72\right)=\left\{0;72;144;216;288;360;...\right\}\)

mà \(250\le x\le350\)

\(\Rightarrow x=288\).

Vậy \(x=288.\)

\(C=\left|-3\left(\dfrac{-13}{15}-\dfrac{17}{21}\right)\right|-\left|\dfrac{-13}{15}+\dfrac{17}{7}\right|+\left(-12+\dfrac{35}{3}\right):\left|-\dfrac{7}{6}\right|\\ =\left|-3.-\dfrac{176}{105}\right|-\left|-\dfrac{6}{35}\right|+\left(-\dfrac{1}{3}\right):\dfrac{7}{6}\\ =\dfrac{176}{35}-\dfrac{6}{35}-\dfrac{1}{3}:\dfrac{7}{6}\\ =\dfrac{176}{35}-\dfrac{6}{35}-\dfrac{2}{7}\\ =\dfrac{170}{35}-\dfrac{2}{7}=\dfrac{32}{7}.\)

\(A=468+15x468+85x468\\ A=468x\left(15+85+1\right)\\ A=468x101\\ A=47268\)