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a) \(48\cdot19+81\cdot48\)
\(=48\cdot\left(19+81\right)\)
\(=49\cdot100\)
\(=4900\)
a: =-12/20+5/20-6/20
=-13/20
b: =10/50-45/50-14/50
=-49/50
c: =31/23-7/32-8/23=1-7/32=25/32
=20/35*31+30/35*41+45/50*41+35/50*57
=5(1/31-1/35+1/35-1/41+1/41-1/50+1/50-1/57)
=5*(1/31-1/57)
=5*26/1767=130/1767
a) 7/10+6/10\(=\frac{13}{10}\)
b) -5/9+2/9\(=\frac{-1}{3}\)
c)1/7+1 6/7\(=2\)
d) 3/13+10/3+1\(=\frac{71}{26}\)
e) 5/12-7/12\(=\frac{-1}{6}\)
f) 7/6+5/6-1/6\(=\frac{11}{6}\)
g) -3/20+7/20-9/20\(=\frac{-1}{4}\)
học tốt
\(a,\dfrac{2}{3}-\dfrac{5}{6}+\dfrac{3}{4}\)
\(=(\dfrac{2}{3}+\dfrac{3}{4})-\dfrac{5}{6}\)
\(=\dfrac{7}{12}\)
\(b,\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{-4}{13}.\dfrac{6}{7}\)
\(=\dfrac{6}{7}.(\dfrac{8}{13}-\dfrac{4}{13})+(\dfrac{6}{13}.\dfrac{9}{7})\)
\(=(\dfrac{6}{7}.\dfrac{4}{13})+\dfrac{54}{91}\)
\(=\dfrac{24}{91}+\dfrac{54}{91}\)
\(=\dfrac{78}{91}=\dfrac{6}{7}\)
\(c,19.(-26)\)
\(=-494\)
a) `2/3 - 5/6 +3/4`
`=4/6-5/6+3/4`
`=-1/6+3/4`
`=-4/24+18/24`
`=14/24=7/12`
b) `6/7 .8/13 +6/13 .9/7 -4/13 .6/7`
`=6/7 .(8/13-4/13) + 6/13 .9/7`
`=6/7 . 4/13 + 6/13 . 9/7`
`= 6/13 .4/7 +6/13 .9/7`
`=6/13 . (4/7+9/7)`
`=6/13 . 13/7`
`=6/7`
c) `19.(-26)`
`=(1-20).(20+6)`
`=20+6-400-120`
`=-494`
a, 48 . 19 + 81 . 48
= 48 . (19 + 81)
= 48 . 100 = 4800
b, 74 : 72 + [ 62 - (102 - 4 . 16)]
= 72 + [36 - (100 - 64)]
= 49 + [36 - 36]
= 49
x, (-115) + (-40) + 115 + |-35|
= [(-115) + 115] + (-40) + 35
= 0 + (-5) = -5
a, 48 . 19 + 81 . 48
= 48 . ( 19 + 81 )
= 48 . 100
= 4800
b,74 : 72 + [ 62 - (102 - 4 . 16)]
= 49 + [ 36 - ( 100 - 4 . 16 )]
= 49 + [ 36 - 36 ]
= 49 + 0
= 49
c,( -115 ) + ( -40 ) + 115 + | -35 |
= [(-115) + 115 ] + (-40) + 35
= 0 + (-40 ) + 35
= -5
HỌC TỐT !