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458 x 105 + 324 x 105
= 105 x ( 458 + 324)
= 105 x 782 = 82110
457 x 207 - 207 x 386
= 207 x ( 457 - 386)
= 207 x 71 = 14697
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76372 - 91000:700+ 2000
= 76372 - 130 + 2000
= 76242+2000
= 78242
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\(\dfrac{15}{16}.\dfrac{8}{5}.\dfrac{3}{4}\)= \(\dfrac{5.3.4.2.3}{4.2.2.5.4}=\dfrac{9}{8}\)
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Lời giải:
$b+c=7891$
$d+a=2109$
$\Rightarrow b+c+d+a=7891+2109=10000$
$10000+(a+b+c+d)\times 9=10000+10000\times 9$
$=10000\times (1+9)=10000\times 10=100000$
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\(1.\) 12 x 11 + 21 x 11 x 11 + 11 x 33
= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )
= \(132+2541+363\)
= \(3036\)
132x11-11x32-54x11
= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )
\(=1452-352-594\)
= \(506\)
\(2.\)
45 x 32 + 1245
= ( 45 x 32 ) + 1245
= 1400 + 1245
= 2685
75 x 18 + 75 x 21
= ( 75 x 18 ) + ( 75 x 21 )
= 1350 + 1575
= 2925
12 x (27+46) -1567
= 12 x 73 - 1567
= ( 12 x 73 ) - 1567
= 876 - 1567
= - 691
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`313 - (107 + 206)`
`= 313 - 313`
`= 0`
`600 0- (2700 + 300)`
`= 6000 - 3000`
`= 3000`
`4480 + 2496 - 1596`
`= 4480 + 900`
`= 5380`
313 – (107 + 206) = 0
6 000 – (2 700 + 300) = 3000
4 480 + 2 496 – 1 596 = 5380
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7 tấn = 7000 kg
7 tấn x4 + 256 kg = ( 7000kg x 4 ) + 256 kg
= 28000kg +256kg
= 28256 kg