- (21- 47 ) + ( 53 - 79 )
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47 x 83 + 21 x 53 + 47 x 17 - 79 x 53
= 47 x (83 + 17) + 53 x (21 - 79)
= 47 x 100 + 53 x (-58)
= 4700 - 3074
= 1626
\(47.83+21.53+47.17-79.53\)
\(=47.\left(83+17\right)+53.\left(79+21\right)\)
\(=47.100+53.100\)
\(=4700+5300\)
\(=10000\)
= 39 . ( 53 + 47 ) - 21 . ( 53 + 47 ) = 39 . 100 - 21 . 100 = 100 . ( 39 - 21 ) = 100 . 18 = 1800
53*39+47*39-53*21-47*21
\(=39x\left(53+47\right)-\left(21x\left(53+47\right)\right)\)
\(=39x100-21x100\)
\(=100x\left(39-21\right)\)
\(=18x100=1800\)
\(53.39+47.39-53.21-47.21\)
\(=53\left(39-21\right)+47\left(39-21\right)\)
\(=\left(39-21\right)\left(53+47\right)\)
\(=18.100=1800\)
53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 )
= 39 x 100 - 21 x 100
= 100 x ( 39 - 21 )
= 100 x 18
= 1800
53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 )
= 39 x 100 - 21 x 100
= 100 x ( 39 - 21 )
= 100 x 18
= 1800
ai k mik k lai
53 .39 + 47 . 39 - 53 . 21 - 47 .21
= (53 + 47) . 39 - (53 + 47) . 21
= 100 . 39 - 100 . 21
= 100 . (39 - 21)
= 100 . 18
= 1800
\(-\left(21-47\right)+\left(53-79\right)\)
\(=\left(47+53\right)-\left(21+79\right)\)
\(=100-100\)
\(=0\)
Vậy \(-\left(21-47\right)+\left(53-79\right)=0\)
-(21-47)+(53-79)
=-(-26) + (-26)
=0