Chu vi hình tròn đó là

`1,15`\(\times\) `3,14 =3,611 (m)`

Đ/s: ...

\(6+2,5\times9\div\dfrac{4}{5}\times0,25\div0,1\)

`= 6+22,5`\(\div\)`4/5`\(\times\)`0,25`\(\div0,1\) 

`= 6+28,125\(\times\)` `0,25`\(\div\)`0,1`

`=6+7,03125`\(\div0,1\)

`=6+70,3125`

`=76,3125`

\(\left(2^3+\left(1+\left(3-1\right)^2\right)\right)\div13\)

\(\Rightarrow\left(2^3\left(1+2^2\right)\right)\div13\)

\(\Rightarrow\left(2^3\left(1+4\right)\right)\div13\)

\(\Rightarrow\left(2^3.5\right)\div13\)

\(\Rightarrow\left(8+5\right)\div13\)

\(\Rightarrow13\div13=1\)

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trèo

\(\left(2^{15}+2^{10}\right)\div\left(1+2^5\right)\)

\(\Rightarrow\left(2^{10}.33\right)\div33\)

\(\Rightarrow2^{10}.\left(33\div33\right)\)

\(\Rightarrow2^{10}.1\)

\(\Rightarrow2^{10}\)