\(\frac{3}{22}\times\frac{3}{11}\times22\)

1.\(=\frac{3\times3\times22}{22\times11\times1}\)

\(=\frac{3\times3}{11\times1}\)

\(=\frac{9}{11}\)

2.  \(=\frac{9}{242}\times22\)

\(=\frac{198}{242}\)

\(=\frac{9\times2\times11}{2\times11\times11}\)

\(=\frac{9}{11}\)

\(\left(\frac{1}{2}+\frac{1}{3}\right)\times\frac{2}{5}\)

1.\(=\frac{5}{6}\times\frac{2}{5}\)

\(=\frac{5\times2}{3\times2\times5}\)

\(=\frac{1}{3}\)

2.\(\)\(=\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}\)

\(=\frac{1}{5}+\frac{2}{15}\)

\(=\frac{3}{15}+\frac{2}{15}\)

\(=\frac{5}{15}=\frac{1}{3}\)

Have a good day

ko ai bit thi thui ko tra loi thi cam

A = x³ - 6x² + 12x + 10

A = (x³ - 6x² + 12x - 8) + 18

A = (x - 2)³ + 18

tại x = 22, có:

A = (x - 2)³ + 18 = (22 - 2)³ + 18 = 20³ + 18 = 8000 + 18 = 8018

Tính giá trị biểu thức sau bằng cách hợp lí :

A = x³ - 6x² +12x + 10

= x³ - 3.x².2 + 3.x.2² - 2³ + 18

= ( x - 2 )³ + 18

Thay x = 22 , ta có :

A = 20³ + 18 = 8018

Ta có : \(A=\frac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right)^2}\)

\(\Rightarrow\)  \(A=\frac{11.3^{22+7}-\left(3^2\right)^{15}}{2^2.\left(3^{14}\right)^2}\)

\(\Rightarrow\)  \(A=\frac{11.3^{29}-3^{30}}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=\frac{3^{29}.\left(11-3\right)}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=\frac{3^{29}.8}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=\frac{3^{29}.2^3}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=3.2\)

\(\Rightarrow\)  \(A=6\)

   Vậy A = 6

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