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Bài 1:
a: -8/12<0<-3/-4
b: -56/24<0<7/3
c: 4/25<1<15/13
=>-4/25>-15/13
Bài 2:
a: =-60/45=-4/3
b: =4/15-3/2-8/5=8/30-45/30-48/30=-85/30=-17/6
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1. 13/21 =182/294 , 9/14 =189/294 . Vì 182 < 189 => 13/21<9/14
2. 6/17 = 150/425 , 9/25 = 153/425 . Vì 150< 153 => 6/17 < 9/25
3. 13/57 = 949/4161 , 29/73= 1653/4161 . Vì 949<1653 =>13/57< 29/73
4. 15/12 > 1 , 42/43 <1 => 15/12 > 42/43
5. 17/16 = 255/240 , 16/15 =256/240 .Vì 255<256 =>17/16<16/15
7. 8 /10 = 4/5= 24/30 , 5/6= 25/30 . Vì 24<25 => 3+5/4+6< 5/6
1. 13/21 =182/294 , 9/14 =189/294 . Vì 182 < 189 => 13/21<9/14
2. 6/17 = 150/425 , 9/25 = 153/425 . Vì 150< 153 => 6/17 < 9/25
3. 13/57 = 949/4161 , 29/73= 1653/4161 . Vì 949<1653 =>13/57< 29/73
4. 15/12 > 1 , 42/43 <1 => 15/12 > 42/43
5. 17/16 = 255/240 , 16/15 =256/240 .Vì 255<256 =>17/16<16/15
7. 8 /10 = 4/5= 24/30 , 5/6= 25/30 . Vì 24<25 => 3+5/4+6< 5/6
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Bài 1:
a) \(\dfrac{-5}{6}\ne\dfrac{10}{-14}\left(\dfrac{10}{-14}=-\dfrac{5}{7}\right).\)
b) \(\dfrac{-15}{-60}\ne\dfrac{-3}{12}\left(\dfrac{-15}{-60}=\dfrac{1}{4}\right).\)
Bài 2:
a) \(\dfrac{20}{-140}=-\dfrac{1}{7}.\)
b) \(\dfrac{4.18}{9.12}=\dfrac{72}{108}=\dfrac{2}{3}.\)
c) \(\dfrac{17.25-17.3}{2.\left(-15\right)}=\dfrac{17.\left(25-3\right)}{-30}=-\dfrac{17.22}{30}=\dfrac{374}{30}=\dfrac{187}{15}.\)
Bài 3:
a) \(\dfrac{-3}{5}< \dfrac{4}{-7}.\)
b) \(\dfrac{-4}{21}>\dfrac{-7}{35}.\)
c) \(\dfrac{-7}{24}>\dfrac{-2}{3}.\)
d) \(\dfrac{-52}{167}< \dfrac{-3}{-4}.\)
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Bài 3:
a: =>x/56=3/7
hay x=21
b: =>3/x=6/14
hay x=7
c: =>35/x=7/15
hay x=75
d: =>2x=-10/9
hay x=-10/18=-5/9
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a: -3/4=-9/12
-5/6=-10/12
mà -9>-10
nên -3/4>-5/6
b: -5/17<0<2/7
c: 11/10>1>9/14
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\(a,\frac{2}{3}>\frac{1}{4}\)
\(b,\frac{7}{10}< \frac{7}{8}\)
\(c,\frac{6}{7}>\frac{3}{5}\)
\(d,\frac{14}{21}< \frac{60}{72}\)
\(e,\frac{16}{9}< \frac{24}{13}\)
\(g,\frac{27}{82}< \frac{26}{75}\)
a 2/3 > 1/4
b 7/10 < 7/8
c6/7 > 3/5
d14/21 < 60/72
e16/9 < 24/13
g27/82<26/75
\(11^{12}< 11^{13}\)
\(7^4< 8^4\)
\(\left(6-5\right)^{132}=1^{132}=1\)
\(\left(7-6\right)^{543}=1^{543}=1\)
\(\Rightarrow\left(6-5\right)^{132}=\left(7-6\right)^{543}\)
\(37\left(3+7\right)=37.10=370\)
\(3^3+7^3=27+343=370\)
\(\Rightarrow37\left(3+7\right)=3^3+7^3\)
\(147\left(14+7\right)=147.21=3087\)
\(14^3+7^3=2744+343=3087\)
\(\Rightarrow147\left(14+7\right)=14^3+7^3\)