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3,4 x (-23,68) - 3,4 x 45,12 + (-31,2) x 3,4
3,4 . [ (-23,68) - 45,12,+ (-31,2)]
=3,4 . -100
=-340
a: =-12,45+12,45+23,4=23,4
b: =32,18-32,18-14,6+14,6+4,125=4,125
c: =4,5(-12,25-17,75)
=-4,5*30=-135
d: =3,4(-23,68-45,12-31,2)
=3,4*(-100)=-340
1: =290-40=250
2: =72,69+18,47-8,47-22,69=50+10=60
3: =2,07-7,64+8,79+1,21-7,36
=10-15+2,07
=-5+2,07
=-2,93
6: =3,58(24,25+75,55)
=100*3,58
=358
a) Ta có:
\(\dfrac{7}{11}=0,\left(63\right)\)
\(\dfrac{8}{-13}=-0,\left(615384\right)\)
\(\dfrac{37}{19}\approx1,95\)
\(\dfrac{-5}{13}=-0,\left(384615\right)\)
\(\Rightarrow-0,\left(615384\right)< -0,\left(384615\right)< 0< 0,\left(63\right)< 1,95\)
\(\Rightarrow\dfrac{8}{-13}< \dfrac{-5}{13}< 0< \dfrac{7}{11}< \dfrac{37}{19}\)
b) Ta có:
\(\dfrac{-9}{17}\approx-0,53\)
\(-\dfrac{6}{5}=-1,2\)
\(\dfrac{7}{-17}\approx-0,41\)
\(\Rightarrow-3,4< -1,2< -1,02< -0,53< -0,41< 0\)
\(\Rightarrow-3,4< -\dfrac{6}{5}< -1,02< \dfrac{-9}{17}< \dfrac{7}{-17}< 0\)
a: 0<7/11
7/11<1
1=19/19<37/19
=>0<7/11<37/19
mà -8/13<-5/13<0
nên -8/13<-5/13<0<7/11<37/19
b: -1<-9/17<-7/17<0
-3,4<-1,2=-6/5<-1,02<-1
Do đó: -3,4<-6/5<-1,02<-1<-9/17<-7/17<0
a: =22+25,5=47,5
b: =-9,207-1,505+3,8-2,8=1-10,712=-9,712
c: \(=2,07+3,005-12,005+4,23=6,3-9=-2,7\)
e: =3,58(24,45+75,55)=3,58*100=358
a)\(\dfrac{-5}{21}:\dfrac{25}{14}=\dfrac{-5}{21}.\dfrac{14}{25}=\dfrac{-2}{15}\)
b)\(3,4:\dfrac{-17}{14}=\dfrac{17}{15}:\dfrac{-17}{14}=\dfrac{17}{15}.\dfrac{14}{-17}=\dfrac{-14}{15}\)
c) \(\left(-1,7\right):1\dfrac{2}{15}=\dfrac{-17}{10}:\dfrac{17}{15}=\dfrac{-17}{10}.\dfrac{15}{17}=\dfrac{-3}{2}\)
d) \(-8,4:\left(-2,8\right)=\dfrac{-42}{5}:\dfrac{-14}{5}=\dfrac{-42}{5}.\dfrac{5}{-14}=3\)
1, 53/51 + 1,75 + 61/8 + 41/4 + 3,875 - 3,4
53/51 + 7/4 + 61/8 + 41/4 + 31/8 - 17/5
53/51 + 7/4 + 61/8 + 31/8 + 41/4 - 17/5
53/51 + 7/4 + 23/2 + 41/4 - 17/5
53/51 + 7/4 + 41/4 + +23/2-17/5
53/51 + 12 + 41/4 + 23/2
= 7097/204
\(\dfrac{1}{2}=1-\dfrac{1}{2}\)
\(\dfrac{2}{3}=1-\dfrac{1}{3}\)
\(\dfrac{3}{4}=1-\dfrac{1}{4}\)
\(\dfrac{4}{5}=1-\dfrac{1}{5}\)
\(\dfrac{1}{2}>\dfrac{1}{3}>\dfrac{1}{4}>\dfrac{1}{5}\)
=>\(-\dfrac{1}{2}< -\dfrac{1}{3}< -\dfrac{1}{4}< -\dfrac{1}{5}\)
=>\(1-\dfrac{1}{2}< 1-\dfrac{1}{3}< 1-\dfrac{1}{4}< 1-\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{1}{2}< \dfrac{2}{3}< \dfrac{3}{4}< \dfrac{4}{5}\)
=>\(-\dfrac{1}{2}>-\dfrac{2}{3}>-\dfrac{3}{4}>-\dfrac{4}{5}\)
