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`a)1 4/23 + ( 5/21-4/23)+16/21-1/2`
`=27/23+5/21-4/23+16/21-1/2`
`=(27/23-4/23)+(5/21+16/21)-1/2`
`=23/23+21/21-1/2`
`=1+1-1/2`
`=2-1/2`
`=4/2-1/2`
`=3/2`
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`b)75%-(5/2+5/3)+(-1/2)^3`
`=3/4-5/2+5/3+(-1/8)`
`=(3/4-5/2-1/8)+5/3`
`=(6/8-20/8-1/8)+5/3`
`=-15/8+5/3`
`=-45/24+40/24`
`=-5/24`
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`c)-3/4(-55/9).8/11`
`=-3/4.(-40/9)`
`=-10/3`
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`d)-3/8 . 6/13 + 7/13 . (-3/8) + 1 3/8`
`= -3/8 . (6/13 + 7/13) + 11/8`
`= -3/8 . 13/13 + 11/8`
`= -3/8 .1 + 11/8`
`= -3/8 + 11/8`
`= 8/8`
`=1`
Câu1:
(-3).5-(-4).6+(-23)
= -15 + 24 - 23
= -15 + (24 -23)
= -15 + 1
= - 14
Câu 2.
-17 -(-5).6+(12-17)2
= -17 + 30 -5.2
= -17 + 30 - 10
= - 17 + (30 - 10)
= -17 + 20
= 3
a; (-5) + 11 + 17 + (-3)
= - 5 + 11 + 17 - 3
= - (5 + 3) + (11 + 17)
= - 8 + 28
= 20
Câu1:
(-3).5-(-4).6+(-23)
= -15 + 24 - 23
= -15 + (24 -23)
= -15 + 1
= - 14
- \(\dfrac{3}{4}\).(-\(\dfrac{55}{9}\)).\(\dfrac{8}{11}\)
= \(\dfrac{3.5.11.4.2}{4.3.3.11}\)
= \(\dfrac{10}{3}\)
1\(\dfrac{4}{23}\) + (\(\dfrac{5}{21}\) - \(\dfrac{4}{23}\)) + \(\dfrac{16}{21}\) - \(\dfrac{1}{2}\)
= 1 + \(\dfrac{4}{23}\) + \(\dfrac{5}{21}\) - \(\dfrac{4}{23}\) + \(\dfrac{16}{21}\) - \(\dfrac{1}{2}\)
= 1 + (\(\dfrac{4}{23}\) - \(\dfrac{4}{23}\)) + (\(\dfrac{5}{21}\) + \(\dfrac{16}{21}\)) - \(\dfrac{1}{2}\)
= 1 + 0 + 1 - \(\dfrac{1}{2}\)
= 2 - \(\dfrac{1}{2}\)
= \(\dfrac{3}{2}\)
- \(\dfrac{3}{8}\).\(\dfrac{6}{13}\) + \(\dfrac{7}{13}\). (-\(\dfrac{3}{8}\)) + 1\(\dfrac{3}{8}\)
= -\(\dfrac{3}{8}\).(\(\dfrac{6}{13}\) + \(\dfrac{7}{13}\)) + 1 + \(\dfrac{3}{8}\)
= - \(\dfrac{3}{8}\) + 1 + \(\dfrac{3}{8}\)
= (-\(\dfrac{3}{8}\) + \(\dfrac{3}{8}\)) + 1
= 0 + 1
= 1
75% - (\(\dfrac{5}{2}\) + \(\dfrac{5}{3}\)) + (\(-\dfrac{1}{2}\))2
= \(\dfrac{3}{4}\) - \(\dfrac{25}{6}\) + \(\dfrac{1}{4}\)
= (\(\dfrac{3}{4}\) + \(\dfrac{1}{4}\)) - \(\dfrac{25}{6}\)
= 1 - \(\dfrac{25}{6}\)
= - \(\dfrac{19}{6}\)