Thực hiện phép tính (tính nhanh nếu có thể): a) $\frac{2}{3}+\frac{-3}{4}+\frac{2}{6}$ b) $3\frac{1}{3}.\frac{-4}{9}+3\frac{1}{3}.\frac{13}{9}-\frac{1}{3}:\frac{1}{4}$
2 câu trả lời
`a)`
`2/3 + {-3}/4 + 2/6`
`= 2/3 - 3/4 + 1/3`
`= 8/12 - 9/12 + 4/12`
`= 1/4`
`b)`
`3 1/3. {-4}/9 + 3 1/3. 13/9 - 1/3 : 1/4`
`= 3 1/3. ( -4/9 + 13/9 ) - 1/3. 4`
`= 10/3. 1 - 4/3`
`= 10/3 - 4/3`
`= 2`
`a)` `2/3` `+` `-3/4` `+` `2/6`
`=` `(2/3` `+` `2/6)` `+` `-3/4`
`=` `1` `+` `-3/4`
`=` `1/4`
`b)` `3``1/3` . `-4/9` `+` `3``1/3` . `13/9` `-` `1/3` `:` `1/4`
`=` `3``1/3`. `(-4/9` `+` `13/9)` `-` `1/3` . `4`
`=` `3``1/3`. `1` `-` `4/3`
`=` `10/3` - `4/3`
`=` `2`
