Thực hiện phép tính
a, 10/17 + 3/5 + 7/9 + 7/17 - 8/5
b, 2^9 : 8
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a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
`a)3/5+(-4/9)`
`=3/5-4/9`
`=27/45-20/45`
`=7/45`
`b)3/5+2/5 . 15/8`
`=3/5 + 30/40`
`=3/5+3/4`
`=12/20+15/20`
`=27/20`
`c)7/2 . 8/13 + 8/13 . (-5/2)`
`=8/13 . (7/2 +(-5)/2)`
`=8/13 . 1`
`=8/13`
`d)-5/17 . (-9/23)+9/23 . (-22/17) + 11 9/23`
`=-5/17 . (-9/23) + 9/23 . (-1) . 22/17 + 11 + 9/23`
`=-5/17 . (-9/23) + (-9/23) . 22/17+11+9/23`
`= -9/23 ( -5/17 + 22/17)+11+9/23`
`= - 9/23 . 1+11+9/23`
`=-9/23+11+9/23`
`=(-9/23+9/23)+11`
`=0+11`
`=11`
a: =27/45-20/45=7/45
b: =3/5+30/40
=3/5+3/4
=12/20+15/20
=27/20
c: =8/13(7/2-5/2+1)=8/13*2=16/13
d: =9/23*5/17-9/23*22/17+11+9/23
=-9/23+11+9/23
=11
a; (-5) + 11 + 17 + (-3)
= - 5 + 11 + 17 - 3
= - (5 + 3) + (11 + 17)
= - 8 + 28
= 20
a) 405 - 15 x 2
= 405 - 30
= 375
b) 28 x 64 + 28 x 36
= 28 x ( 64 + 36 )
= 28 x 100
= 2800
c) ( -17 + ( -8 ) + 17 + ( -3 )
= [ ( -17 ) + 17 ] + [ ( -8 ) + ( -3 ) ]
= 0 + ( -11 )
= -11
d) 235 - 4 x { 20 + [ 72 : ( 23 - 1 ) ] }
= 235 - 4 x { 20 + [ 49 : ( 8 - 1 ) ] }
= 235 - 4 x { 20 + [ 49 : 7 ] }
= 235 - 4 x { 20 + 7 }
= 235 - 4 x 27
= 235 - 108
= 127
e) 8 - ( 3 - 7 )
= 8 - 3 + 7
= 5 + 7
= 12
g) 9 - ( -7 ) - 3
= 9 + 7 - 3
= 16 - 3
= 13
f) ( -5 ) - ( 9 - 12 )
= ( -5 ) - 9 +12
= -14 + 12
= -2
Bài 2 :
a, \(x=\dfrac{3}{5}-\dfrac{7}{8}=\dfrac{24-30}{40}=-\dfrac{6}{40}=-\dfrac{3}{20}\)
b, \(2x-1=-2\Leftrightarrow x=-\dfrac{1}{2}\)
a, \(\left(-17\right)+5+8+17+\left(-3\right)\)
\(=\left(-17+17\right)+\left[5+\left(-3\right)\right]+8\)
\(=0+8+8=8+8=16\)
b, \(\left(5^{19}:5^{17}+3\right):7=\left(5^2+3\right):7\)
\(=\left(25+3\right):7=28:7=4\)
c, \(|-8|+\left(-5\right)+9+\left(-7\right)+|-4|\)
\(=8-5+9-7+4=3+2+4=5+4=9\)
ý d mk ko biết nha.
thông cảm cho mk nha.
k mk nha.
#mon
a,\(\frac{10}{7}+\frac{3}{5}+\frac{7}{9}+\frac{7}{17}-\frac{8}{5}=\frac{1733}{1071}\)
b,29:8=512:8=64
a,
=\(\left(\frac{10}{17}+\frac{7}{17}\right)+\frac{3}{5}-\frac{8}{5}+\frac{7}{9}\)
=\(1+\frac{3}{5}-\frac{8}{5}+\frac{7}{9}\)
=\(\frac{8}{5}-\frac{8}{5}+\frac{7}{9}=\frac{7}{9}\)