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c) Ta có: \(\dfrac{3}{5}+\dfrac{-5}{20}+\dfrac{30}{75}+\dfrac{-7}{4}\)
\(=\dfrac{3}{5}+\dfrac{2}{5}+\dfrac{-1}{4}+\dfrac{-7}{4}\)
\(=1-2=-1\)
Giải:
a)-1/12+4/3=-1/12+16/12=15/12=5/4
b)(-4/14-3/15)-(1/5-20/35-(-1)).7
=-17/35-22/35.7
=-17/35-22/5
=-171/35
c)3/5+-5/20+30/75+-7/4
=3/5+-1/4+2/5+-7/4
=(3/5+2/5)+(-1/4+-7/4)
=1+-2
=-1
d)5/6.-12/14+7/13
=-5/7+7/13
=-16/91
e)2/-9-5/-36-1/4
=-1/12-1/4
=-1/3
f)2/23+-5/12+7/18+21/23+-7/12
=(2/23+21/23)+(-5/12+-7/12)+7/18
=1+-1+7/18
=7/18
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a: \(=\dfrac{-5}{8}+\dfrac{7}{12}=\dfrac{-15}{24}+\dfrac{14}{24}=\dfrac{-1}{24}\)
b: \(=\dfrac{3}{4}-\dfrac{5}{6}+\dfrac{11}{12}=\dfrac{9}{12}-\dfrac{10}{12}+\dfrac{11}{12}=\dfrac{10}{12}=\dfrac{5}{6}\)
c: \(=\dfrac{6}{36}-\dfrac{1}{36}=\dfrac{5}{36}\)
d: \(=\dfrac{5}{12}+\dfrac{5}{12}=\dfrac{10}{12}=\dfrac{5}{6}\)
e: \(=\dfrac{-8}{56}-\dfrac{7}{56}=\dfrac{-15}{56}\)
f: \(=\dfrac{-5}{15}+\dfrac{3}{25}=\dfrac{-25}{75}+\dfrac{9}{75}=\dfrac{-16}{75}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
S=(1/9-5/6-4)/(7/12-1/36-10)
=(2/18-15/18-4)/(21/36-1/36-10)
=(-13/18-4)/(5/9-10)
=(-85/18)/(-85/9)
=-85/18.9/-85=9/18=1/2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 7/10+6/10\(=\frac{13}{10}\)
b) -5/9+2/9\(=\frac{-1}{3}\)
c)1/7+1 6/7\(=2\)
d) 3/13+10/3+1\(=\frac{71}{26}\)
e) 5/12-7/12\(=\frac{-1}{6}\)
f) 7/6+5/6-1/6\(=\frac{11}{6}\)
g) -3/20+7/20-9/20\(=\frac{-1}{4}\)
học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
1/9-5/6-4/7/12-1/36-10
=6/54-45/54-216/54/21/36-1/36-360/36
=-255/54/-340/36
=-85/18-85/9
=-85/18-170/18
=-255/18
=-85/6
tính mà rối loạn lão
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -5/6:2/7=-5/6x7/2=-35/12
b) -7/8:-1/4=-7/8x4/-1=-28/-8=7/2
c) -12:6/7=-12/1x7/6=-84/6=-14
d)1/15:-3/5=1/15x5/-3=5/-45=1/-9
e)0:-5/36=0
f)7/9:(-7)=7/9x(-7)=7/-63
![](https://rs.olm.vn/images/avt/0.png?1311)
F=(-85/18):(-85/9)
F=1/2