3/5-2/7<2/3x+3/4>1/2+7/9
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Tính:
2/7 + 5/7=1
8/15 + 6/15 =14/15
2/9 + 3/9 + 4/9=9/9=1
[ Không cần làm phép tính ]Điền vào ô trống <,>,= :
3/5 + 1/5 = 1/5 + 3/5
7/9 + 1/9 < 7/9 + 1/9 + 1/9
3/7 + 2/7 < 3/7 + 4/7
1/5 + 3/5 < 2/5 + 3/5
Tính:
2/7 + 5/7=1
8/15 + 6/15 =14/15
2/9 + 3/9 + 4/9=9/9=1
[ Không cần làm phép tính ]Điền vào ô trống <,>,= :
3/5 + 1/5 = 1/5 + 3/5
7/9 + 1/9 < 7/9 + 1/9 + 1/9
3/7 + 2/7 < 3/7 + 4/7
1/5 + 3/5 < 2/5 + 3/5
\(\left(-\dfrac{1}{2}\right)-\left(-\dfrac{3}{5}\right)+9-\dfrac{1}{9}+\dfrac{1}{71}-\left(-\dfrac{2}{7}\right)+\dfrac{4}{35}-\dfrac{7}{18}\)
\(=\left(-\dfrac{22635}{44730}\right)-\left(-\dfrac{26838}{44730}\right)+\dfrac{402570}{44730}-\dfrac{4970}{44730}+\dfrac{630}{44730}-\left(-\dfrac{12780}{44730}\right)+\dfrac{5112}{44730}-\dfrac{35784}{44730}\)
\(=\left(-\dfrac{22635}{44730}\right)+\dfrac{26838}{44730}+\dfrac{402570}{44730}-\dfrac{4970}{44730}+\dfrac{630}{44730}+\dfrac{12780}{44730}+\dfrac{5112}{44730}-\dfrac{35784}{44730}\)
\(=\dfrac{-22635+26838+402570-4970+630+12780+5512-35784}{44730}\)
\(=\dfrac{384941}{44730}\)
\(=\dfrac{-1}{2}+\dfrac{3}{5}-\dfrac{1}{9}+\dfrac{1}{71}+\dfrac{2}{7}+\dfrac{4}{35}-\dfrac{7}{18}\)
\(=\left(-\dfrac{1}{2}-\dfrac{1}{9}-\dfrac{7}{18}\right)+\left(\dfrac{3}{5}+\dfrac{2}{7}+\dfrac{4}{35}\right)+\dfrac{1}{71}\)
=1/71
a) -1/24 - [ 1/4 - ( 1/2 - 7/8 )]
= -1/24 - [ 1/4 +3/8 ]
= -1/24 - 5/8
= -2/3.
a) -1/24 - [ 1/4 - ( 1/2 - 7/8 )]
= -1/24 - [ 1/4 +3/8 ]
= -1/24 - 5/8
= -2/3.
1)(-6-25).(-6+2)=-31*(-4)=124
2) \(\frac{7\cdot3-9}{-6}=\frac{12}{-6}=-2\)
3) (-5+19).(-4)=14*(-4)=-56
4) \(\frac{872}{-6\cdot2+4}=\frac{872}{-12+4}=\frac{872}{-8}=-109\)
5) -3*7-4*(-5)+19=-21+20+19=18
6)\(18-\frac{10}{2}-71=18-5-71=-58\)
7) \(\frac{115}{-5}\cdot\left(-3\right)-8=69-8=61\)
8) \(\left(6\cdot8-\frac{20}{5}\right)+3\cdot\left(-7\right)=48-4-21=23\)