a) 5x99x2=5x2x99=10x99=990
b)208x97+208x3=208x(97+3)=208x100=20800
a) 5 x 99 x 2 = (5 x 2 ) x 99 = 10 x 99 = 990
b) 208 x 97 + 208 x 3 = 208 x (97 + 3 ) = 208 x 100 = 20800
mình nhanh nhất!!!!!
a) 5 . 99 . 2
= 99 . (5 .2)
= 99 . 10
= 990
b) 208 x 97 + 208 x 3
=208 . ( 97 + 3 )
= 208 . 100
= 20800
a, 5 x 99 x 2
= (5x2)x 99
=10x99
= 990
b, 208x 97+208x3
= 208 x( 97+3)
= 208 x 100
= 20 800.
Tính bằng cách thuận tiện :
5 x 99 x 2
= ( 5 x 2 ) x 99
= 10 x 99
= 990
208 x 97 + 208 x 3
= 208 x ( 97 + 3 )
= 208 x 100
= 20800
a ) 5 X 99 X 2
= 99 X ( 5 X 2 )
= 99 X 10
= 990
b) 208 X 97 + 208 X 3
= 208 X ( 97 + 3 )
= 208 X 100
= 20800
5 x 99 x 2
= [ 5 x 2 ] x 99
=10 x 99
=990
208 x 97 + 208 x 3
= 208 x[97 + 3]
=208x100
=20800
a) 5x99x2
=99x(5x2)
=99x10
=990
b) 208x97+208x3
=208x(97+3)
=208x100
=20800
a 5*99*2 b208*97+208*3
(5*2)*99 208*(97+3)
10*99 208*100
990 20800