Giải thích các bước giải:
a/. 5 - 2. (`(-1)/2`)²
= 5 - 2 . `1/4`
= 5 - `1/2`
= `(10)/2` - `1/2`
= `9/2`
b/. 3 - 1`4/5` : `(-3)/4`
= 3 - `9/5`. `(-4)/3`
= 3 - `(-12)/5`
= `(15)/5` - `(-12)/5`
= `(27)/5`
c/. `4/5`. 19`1/3` - `4/5`.39`1/3`
= `4/5` . `(58)/3` - `4/5`. `(118)/3`
= `4/5` .(`(58)/3` - `(118)/3`)
= `4/5` . `(-60)/3`
= `4/5` . - 20
= - 16
d/. 4 . (`(-1)/2`)² + `1/2`
= 4. `1/4` + `1/2`
= 1 + `1/2`
= `2/2` + `1/2`
= `3/2`
e/. `1/(10)` - `(-1)/(12)` + `1/(15)`
= `1/(10)` + `1/(12)` + `1/(15)`
= `6/(60)` + `5/(60)` + `4/(60)`
= `(15)/(60)`
= `1/4`
g/. `(11)/(50)`.(- 17`1/2`) - `(11)/(50)`. 82`1/2`
= `(11)/(50)`.`(-35)/2`) - `(11)/(50)`.`(165)/2`
= `(11)/(50)`.(`(-35)/2` -`(165)/2`)
= `(11)/(50)`. `(-200)/2`
= `(11)/(50)`. -100
= - 22
