28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x ( 47 + 43 ) + 72 x ( 29 + 61)
= 28 x 90 + 72 x 90
= 90 x ( 28 + 72)
= 90 x 100
= 9 000
k mk nha
28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x (47 + 43) + 72 x (29 + 61)
= 28 x 90 + 72 x 90
= (28 + 72) x 90
= 100 x 90 = 9000
28 x 47 + 28 x 43 + 72 x 29 + 72x 61
= 28( 47 + 43 ) + 72 x ( 61+ 29)
=28 x 90 + 72 x 90
= 90 x (28 + 72 )
= 90 x 100 = 9000
28*47+28*43+72*29+72*61
= 28*(37+43)+72*(29+61)
=28*90+72*90
=90*(28+72)
=90*100
=9000
ủng hộ nha mn
=
28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
=28 (47 + 43) + 72 x (29 + 61)
=28 x 90 + 72 x 90
=90 (28 + 72)
=90 x 100
=9000
Tính nhanh :
28 * 47 + 28 * 43 + 72 * 29 + 72 * 61
= 28 * ( 47 + 43 ) + 72 * ( 29 + 61 )
= 28 * 90 + 72 * 90
= 90 * ( 28 + 72 )
= 90 * 100
= 9 000
28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x (47 + 43) + 72 x (29 + 61)
= 28 x 90 + 72 x 90
= 90 x (28 + 72)
= 90 x 100
= 9 000