Question

thực hiện phép tính

\(\dfrac{16}{103}\)+(38+\(\dfrac{-16}{103}\))

\(\dfrac{100}{91}\)+310+\(\dfrac{-9}{91}\)

\(\dfrac{-13}{49}\)+(\(\dfrac{-36}{49}\)+41)

\(\dfrac{-10}{71}\):1\(\dfrac{4}{71}\)

\(\dfrac{4}{15}\)+\(\dfrac{8}{15}\):2 -\(\dfrac{1}{18}\).\(\left(-3\right)^2\)

Answer 1

`16/803+38+(-16/803)`
`=16/803-16/803+38`
`=0+38=38`

Answer 2

`100/91+310-9/91`
`=100/91-9/91+310`
`=1+310=311`

Answer 3

\(\dfrac{16}{103}+\left(38+\dfrac{-16}{103}\right)\)

\(=\dfrac{16}{103}+38+\dfrac{-16}{103}\)

\(=\dfrac{16}{103}+\dfrac{-16}{103}+38\)

\(=0+38\)

\(=38\)

Answer 4

\(\dfrac{100}{91}+310+\dfrac{-9}{91}\)

\(=\dfrac{100}{91}+\dfrac{-9}{91}+310\)

\(=1+310=311\)

Answer 5

\(\dfrac{-13}{49}+\left(\dfrac{-36}{49}+41\right)\)

\(=\dfrac{-13}{49}+\dfrac{-36}{49}+41\)
\(=-1+41\)

\(=40\)

 

Answer 6

\(\dfrac{16}{103}+\left(38+\dfrac{-16}{103}\right)\) 

\(=\dfrac{16}{103}+38+\dfrac{-16}{103}\) 

\(=\left(\dfrac{16}{103}+\dfrac{-16}{103}\right)+38\) 

\(=0+38\)  

\(=38\)

\(\dfrac{100}{91}+310+\dfrac{-9}{91}\) 

\(=\left(\dfrac{100}{91}+\dfrac{-9}{91}\right)+310\) 

\(=1+310\) 

\(=311\)

Answer 7

\(\dfrac{-13}{49}+\left(\dfrac{-36}{49}+41\right)\) 

\(=\dfrac{-13}{49}+\dfrac{-36}{49}+41\) 

\(=\left(\dfrac{-13}{49}+\dfrac{-36}{49}\right)+41\) 

\(=-1+41\) 

\(=40\) 

\(\dfrac{-10}{71}:1\dfrac{4}{71}=\dfrac{-10}{71}:\dfrac{75}{71}=\dfrac{-10}{71}.\dfrac{71}{75}=\dfrac{-10.71}{71.75}=\dfrac{-2}{15}\) 

\(\dfrac{4}{15}+\dfrac{8}{15}:2-\dfrac{1}{18}.\left(-3\right)^2\) 

\(=\dfrac{4}{15}+\dfrac{4}{15}-\dfrac{1}{18}.9\) 

\(=\dfrac{8}{15}-\dfrac{1}{2}\) 

\(=\dfrac{1}{30}\)