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650 x 34 + 34 x 2 x 135 + 34 x 80
= 650 x 34 + 34 x 270 + 34 x 80
= 34 x ( 650 + 270 + 80 )
= 34 x 1000
= 34000
Tick nha
650 x 34 + 34 x 2 x 135 + 34 x 80
= 650 x 34 + 34 x 270 + 34 x 80
= 34 x ( 650 + 270 + 80 )
= 34 x 1000
= 34000
135 x 37 + 135 + 62 x 135
= 135 x 37 + 135 x 1 + 62 x 135
= 135 x ( 37 + 1 + 62)
= 135 x 100
= 13500
`3/7+2/5+4/7`
`=(3/7+4/7)+2/5`
`=1+2/5`
`=5/5+2/5`
`=7/5`
`20/34+4/9+7/17`
`=(20/34+7/17)+4/9`
`=(20/34+14/34)+4/9`
`=34/34+4/9`
`=1+4/9`
`=9/9+4/9`
`=13/9`
`48xx2+96+48xx6`
`=48xx2+48xx2+48xx6`
`=48xx(2+2+6)`
`=48xx10`
`=480`
câu thứ hai thì làm như này em nhé:
\(\dfrac{20}{34}\) + \(\dfrac{4}{9}\) + \(\dfrac{7}{17}\)
= (\(\dfrac{20}{34}\) + \(\dfrac{7}{17}\)) + \(\dfrac{4}{9}\)
= (\(\dfrac{10}{17}\) + \(\dfrac{7}{17}\)) + \(\dfrac{4}{9}\)
= 1 + \(\dfrac{4}{9}\)
= \(\dfrac{13}{9}\)
$#Shả$
`A)=5/17xx(15/34+19/34)`
`=5/17xx1=5/17`
`B)=(13/12+7/12)+1/3`
`=5/3+1/3=2`
a,=3/13.17/29.29/34
=3/13.1/2
=3/26
b,=(4/21+25/42).19/33
=11/14.19/33
=19/42
`a, = 3/13 xx (17/29 xx 29/34)`
`= 3/13 xx 1/2`
`= 3/26`.
`b, = 19/33(4/21 + 25/42)`
`= 19/33 xx ( 33/42 )`
`= 19/42`
135 x 27 135 x 72 + 135
= 135 x 27 135 x 72 + 135 x 1
= 135 x ( 27 + 72 + 1 )
= 135 x 100
= 13 500
=(2.34).135+(17.2).80+650.34
=34.(135+135+80+650)
=34.900
=30600