a)$\frac{(2012)^{0}}{2}$+$\frac{/-3/}{4}$+$\frac{5.(-1)^{2012}}{2^{3}}$
b)$\frac{-3}{4}$.$\frac{4}{7}$+$\frac{-3}{7}$.$\frac{3}{7}$+$\frac{2}{-5}$
c)($\frac{3}{4}$-$\frac{5}{6}$+$\frac{7}{12}$).($\frac{-12}{7}$)
d)1,4. $\frac{15}{49}$-($\frac{4}{5}$+$\frac{2}{3}$):2$\frac{1}{5}$
Đáp án:
$a/$ `(2012)^0/2 + (|-3|)/4 + (5 . (-1)^{2012})/2^3`
`= 1/2 + 3/4 + 5/8`
`= 5/4 + 5/8`
`= 15/8`
$b/$ `(-3)/4 . 4/7 + (-3)/7 . 3/7 + 2/(-5)`
`= (-3)/7 + (-3)/7 . 3/7 + (-2)/5`
`= (-3)/7 . (1 + 3/7) + (-2)/5`
`= (-3)/7 . 10/7 + (-2)/5`
`= (-30)/49 + (-2)/5`
`= (-248)/245`
$c/$ `1,4 . 15/49 – (4/5 + 2/3) : 2 1/5`
`= 3/7 – 22/15 : 11/5`
`= 3/7 – 2/3`
`= (-5)/21`
a) `(2012^0)/2` + `|-3|/4` + `5.(-1)^2012/2^3`
= `1/2` + `3/4` + `5/8`
= `5/4` + `5/8`
= `15/8`
b)`-3/4` . `4/7` + `-3/7` . `3/7` + `-2/5`
= `-3/7` + `-3/7` . `3/7` + `-2/5`
= `-3/7`.`(1 + 3/7)` + `-2/5`
= `-3/7` . `10/7` + `-2/5`
= `-30/49` + `-2/5` = `-248/245`
c)`(3/4 – 5/6 + 7/12)` . `(-12/7)`
= `1/2` . `(-12/7)`
= `-6/7`
d)1,4 . `15/49` – `(4/5 + 2/3)` : `2 1/5`
= `7/5` – `22/15` . `5/11`
= `7/5` – `2/3` = `11/15`