làm bài 49 nha
a,1/8-1/2
b,-11/12-(-1)
c,3/5-5/6
d,-1/16-1/15
e,11/36–7/24
g,-5/9–5/12
làm bài 49 nha a,1/8-1/2 b,-11/12-(-1) c,3/5-5/6 d,-1/16-1/15 e,11/36–7/24 g,-5/9–5/12
By Maya
By Maya
làm bài 49 nha
a,1/8-1/2
b,-11/12-(-1)
c,3/5-5/6
d,-1/16-1/15
e,11/36–7/24
g,-5/9–5/12
Hướng dẫn giải
Câu a:
1/8−1/2=1/8+(−1/2)
=18+−48=−3/8
Câu b:
−11/12−(−1)=−11/12−(−12/12)
=−11/12+12/12=112.
Câu c:
3/5−5/6=3/5+(−5/6)
=18/30+(−25/30)=1/8+(−25)/30=−7/30.
Câu d:
−1/16−1/15=−1/16+(−1/15)
=−15/240+(−16/240)=−31/240
Câu e:
11/36−(−7/24)=11/36+7/24
=22/72+21//72=43/72
Câu g
−5/9−(−5/12)=−5/9+5/12
=−20/36+15/36=−5/36
$\text {a, $\frac{1}{8}$- $\frac{1}{2}$}$
$\text {=$\frac{1}{8}$- $\frac{4}{8}$ }$
$\text {=$\frac{-3}{8}$ }$
$\text {b, $\frac{-11}{12}$- (-1) }$
$\text {=$\frac{-11}{12}$+$\frac{12}{12}$ }$
$\text {=$\frac{1}{12}$ }$
$\text {c, $\frac{3}{5}$- $\frac{5}{6}$ }$
$\text {=$\frac{15}{30}$ -$\frac{25}{30}$ }$
$\text {=$\frac{-10}{30}$= $\frac{-1}{3}$ }$
$\text {d, $\frac{-1}{16}$- $\frac{1}{15}$ }$
$\text {=$\frac{-15}{240}$- $\frac{16}{240}$ }$
$\text {=$\frac{-31}{240}$ }$
$\text {e, $\frac{11}{36}$- $\frac{7}{24}$ }$
$\text {=$\frac{22}{72}$- $\frac{21}{72}$ }$
$\text {=$\frac{1}{72}$ }$
$\text {g, $\frac{-5}{9}$- $\frac{5}{12}$ }$
$\text {=$\frac{-20}{46}$- $\frac{15}{36}$ }$
$\text {=$\frac{-35}{36}$ }$
$\text {Chúc bạn học tốt~}$