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a, 64 . 23 + 37 . 23 - 23
= 23. (64 + 37 - 1)
= 23 . 100
=2300
b, 33,76 + 19,52 + 6,24
= (33,76 + 6,24) + 19,52
= 40 + 19,52
= 59,52
c, 38/11 + (16/13 + 6/11)
= 38/11 + 16/13 + 6/11
= (38/11 + 6/11) + 16/13
= 4 + 16/13
= 52/13 + 16/13
= 68/13
d, 3/4 : 3/5 - 1/5
= 3/4 . 5/3 - 1/5
= 5/4 - 1/5
= 25/20 - 4/20
= 21/20
e, \(5\frac{3}{4}\div\frac{12}{13}+6\frac{1}{4}\div\frac{12}{13}\)
\(=\frac{23}{4}\cdot\frac{13}{12}+\frac{25}{4}\cdot\frac{13}{12}\)
\(=\frac{13}{12}\cdot\left(\frac{23}{4}+\frac{25}{4}\right)\)
\(=\frac{13}{12}\cdot12=13\)
f, S = 1 + 2 + 3 + 4 + ... + 99 + 100
Số số hạng của S là :
(100 - 1) : 1 + 1 = 100 (số hạng)
Tổng của S là :
(1 + 100) . 100 : 2 = 5050
Vậy S = 5050
Dấu " . " là dấu nhân nhé :D
Bài 1:
5; (-23) + 105
= 105 - 23
= 82
6; 78 + (-123)
= 78 - 123
= - (123 - 78)
= - 45
bài1
1)2763 + 152 = 2915
2)-7 +(-14)
=-(14 +7)
=-21
`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`
___
`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`
___
`c)-3/4(-55/9).8/11`
`=-3/4.(-40/9)`
`=-10/3`
__
`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`
a: \(=\left(15-6-\dfrac{13}{18}\right):\dfrac{298}{27}-\dfrac{17}{8}:\dfrac{51}{40}\)
\(=\dfrac{149}{18}\cdot\dfrac{27}{298}-\dfrac{5}{3}=\dfrac{3}{2}-\dfrac{5}{3}=\dfrac{9-10}{6}=\dfrac{-1}{6}\)
b: \(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\dfrac{-22}{15}:\dfrac{11}{2}\)
\(=\dfrac{3}{4}-\dfrac{4}{15}=\dfrac{29}{60}\)
c: \(=\dfrac{-7}{9}\left(\dfrac{4}{11}+\dfrac{7}{11}\right)+5+\dfrac{7}{9}=\dfrac{-7}{9}+\dfrac{7}{9}+5=5\)
d: \(=\dfrac{1}{2}\cdot\dfrac{4}{3}\cdot10\cdot\dfrac{1}{5}\cdot\dfrac{3}{4}=1\)
e: \(=\dfrac{4}{25}+\dfrac{11}{2}\cdot\dfrac{5}{2}+\dfrac{-23}{4}=\dfrac{204}{25}\)
a/=23.(64+37-1)
=23.100
=2300
b/=(33,76+6,24)+19,52
=40+19,52
=59,52
c/=38/11+16/13+6/11
=(38/11+6/11) +16/13
=44/11+16/13
=4+1/3/13
=5/3/13
d/=3/4.5/3-1/5
=5/4-1/5
=25/20-4/20
=21/20
=1/1/20
tick đúg mk nha
Thank khi giup toi lam bai tap ve nha