tìm một cách hợp lý:
a.-5/8.5/12+5/8.-7/12+2 1/8
b.5/7.40/11-5/11.117/7
c.4,35-(2,67-1,65)+(3,54-6,33)
d.2.63.24,45+2,63.75,55
e.(-16).(-0,125).(-0,5)
tìm hộ e e cảm ơn
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4,35-(2,67-1,65)+(3,54-6,33)
= 4,35-2,67+1,65+3,54-6,33
=(4,35+1,65)-(2,67+6,33)+3,54
=6-9+3,54
=0,54
a) 60,7 + 25,5 - 38,7=46,8
b) (-9,207) + 3,8 + (-1,5030) - 2,8=-9,71
c) (-12,5) + 17,55 + (-3,5) - (-2,45)=4
a) \(A=\left\{x\in N|0\le x\le4\right\}\)
b) \(B=\left\{x\in N|x=4k;0\le k\le4;k\in N\right\}\)
c) \(C=\left\{x\in Z|x=\left(-3\right)^k;1\le k\le4;k\in N\right\}\)
d) \(D=\left\{x\in N|x=k^2;k=3a;1\le a\le4;a\in N\right\}\)
a: \(=\dfrac{15}{4}:\dfrac{2-7}{16}-\dfrac{5}{9}\cdot\left(\dfrac{3}{5}+\dfrac{4}{5}\right)\)
\(=\dfrac{15}{4}\cdot\dfrac{16}{-5}-\dfrac{5}{9}\cdot\dfrac{7}{5}\)
\(=\dfrac{-240}{20}-\dfrac{7}{9}=-12-\dfrac{7}{9}=\dfrac{-115}{9}\)
c: \(=\dfrac{1}{5}-\dfrac{7}{2}-\dfrac{3}{2}+\dfrac{5}{4}\)
\(=\dfrac{4+25}{20}-5=\dfrac{29}{20}-\dfrac{100}{20}=\dfrac{-71}{20}\)
d: \(=\dfrac{12}{17}\left(1-\dfrac{1}{15}-\dfrac{4}{5}+1\right)=\dfrac{12}{17}\cdot\dfrac{17}{15}=\dfrac{12}{15}=\dfrac{4}{5}\)
e: \(=\dfrac{2}{15}\cdot\dfrac{9}{8}-\dfrac{7}{4}\cdot\dfrac{9}{8}+\dfrac{25}{36}\)
\(=\dfrac{9}{8}\left(\dfrac{2}{15}-\dfrac{7}{4}\right)+\dfrac{25}{36}\)
\(=\dfrac{9}{8}\cdot\dfrac{8-105}{60}+\dfrac{25}{36}\)
\(=\dfrac{9}{8}\cdot\dfrac{-97}{60}+\dfrac{25}{36}=\dfrac{-1619}{1440}\)
`#` `\text{dkhanhqlv}`
`a)1/8-1/2`
`=1/8-4/8`
`=-3/8`
`b)-11/12-(-1)`
`=-11/12+1`
`=-11/12+12/12`
`=1/12`
`c)3/5-5/6`
`=18/30-25/30`
`=-7/30`
`d)-1/16-1/15`
`=-15/240-16/240`
`=-31/240`
`e)11/36-(-7/24)`
`=11/36+7/24`
`=22/72+21/72`
`=43/72`
`g)-5/9-(-5/12)`
`=-5/9+5/12`
`=-20/36+15/36`
`=-5/36`
a) \(\dfrac{1}{8}-\dfrac{1}{2}=\dfrac{1}{8}-\dfrac{4}{8}=-\dfrac{3}{8}\)
b) \(-\dfrac{11}{12}-\left(-1\right)=-\dfrac{11}{12}+\dfrac{12}{12}=\dfrac{1}{12}\)
c) \(\dfrac{3}{5}-\dfrac{5}{6}=\dfrac{18}{30}-\dfrac{25}{30}=-\dfrac{7}{30}\)
d) \(-\dfrac{1}{16}-\dfrac{1}{15}=-\dfrac{15}{240}-\dfrac{16}{240}=-\dfrac{31}{240}\)
e) \(\dfrac{11}{36}-\left(-\dfrac{7}{24}\right)=\dfrac{11}{36}+\dfrac{7}{24}=\dfrac{22}{72}+\dfrac{21}{72}=\dfrac{43}{72}\)
g) \(-\dfrac{5}{9}-\left(-\dfrac{5}{12}\right)=-\dfrac{5}{9}+\dfrac{5}{12}=-\dfrac{20}{36}+\dfrac{15}{36}=-\dfrac{5}{36}\)
a) -5/8 . 5/12 + 5/8.(-7/12) + 2 1/8
= -5/8 . (5/12 + 7/12) + 17/8
= -5/8 + 17/8
= 12/8
= 3/2
b) 5/7 . 40/11 - 5/11 . 117/7
= 5/7 . (40/11 - 117/11)
= 5/7 . (-7)
= -5
c) 4,35 - (2,67 - 1,65) + (3,54 - 6,33)
= 4,35 - 2,67 + 1,65 + 3,53 + 6,33
= (4,35 + 1,65) - (2,67 + 6,33) + 3,53
= 6 - 9 + 3,33
= -3 + 3,33
= 0,33
d) Sửa đề: 2,63.24,45 + 2,63.75,55
= 2,63.(24,45 + 75,55)
= 2,63 . 100
= 263
e) (-16).(-0,125).(-0,5)
= 2.(-8).(-0,25).(-0,5)
= [2.(-0,5)].[-8.(-0,125)]
= -1.1
= -1