Question

Tính nhanh

Answer 1

`@` `\text {Ans}`

`\downarrow`

`b)`

`12/11 + 7/15*9/22 - (-8)/15*9/22`

`= 12/11+ 9/22*(7/15 - (-8)/15)`

`=12/11 + 9/22*(7/15+8/15)`

`= 12/11+ 9/22*15/15`

`= 12/11 + 9/22*1`

`= 12/11+9/22`

`= 24/22 + 9/22`

`= 33/22`

`= 3/2`

Answer 2

\(\dfrac{12}{11}+\dfrac{7}{15}\cdot\dfrac{9}{22}-\dfrac{-8}{15}\cdot\dfrac{9}{22}\)

\(=\dfrac{12}{11}+\dfrac{9}{22}\cdot\left(\dfrac{7}{15}-\dfrac{-8}{15}\right)\)

\(=\dfrac{12}{11}+\dfrac{9}{22}\cdot\dfrac{15}{15}\)

\(=\dfrac{12}{11}+\dfrac{9}{22}\)

\(=\dfrac{24}{22}+\dfrac{9}{22}\)

\(=\dfrac{33}{22}\)

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