\(-\left(21-47\right)+\left(53-79\right)\)
\(=\left(47+53\right)-\left(21+79\right)\)
\(=100-100\)
\(=0\)
Vậy \(-\left(21-47\right)+\left(53-79\right)=0\)
-(21-47)+(53-79)
=-(-26) + (-26)
=0
\(-\left(21-47\right)+\left(53-79\right)\)
\(=\left(47+53\right)-\left(21+79\right)\)
\(=100-100\)
\(=0\)
Vậy \(-\left(21-47\right)+\left(53-79\right)=0\)
-(21-47)+(53-79)
=-(-26) + (-26)
=0
47 x 83 + 21 x 53 + 47 x 17 - 79 x 53
47 x 83 + 21 x 53 + 47 x 17 - 79 x 53
53 . 39 + 47 . 39 - 53 . 21 - 47 .21
tính nhanh
53 + 39 + 47 x 39 - 53 x 21 - 47 x 21
Tính nhanh
53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
53 * 39 + 43 * 39 – 53 * 21 – 47 * 21
341 x 67 + 341 x 16 + 659 x 83
42 x 53 + 47 x 156 - 47 x 144
53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40
Tính hợp lí
a) 1050:15-150:15+150:19+1940
b)53*39+47*39-53*21-47*21
c)2*53*12+4*6*87
Tính nhanh
a) 491 x (267+53) - 491 x ( 153 + 67 )
b) 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21