a , 4*2 + 4*5 +4 = 4* 2 + 4*5 + 4*1 = 4* ( 2+5+1 ) = 4*8
b, a*7 +a*2 +a= a*7 + a*2 + a*1 = a* ( 7 + 2+1 ) = a* 10
a) 4 x 8
b) 10a
@Doris (Team ASL)
bn lm nhanh ghê rứa? :v
a) 4 x 2 + 4 x 5 + 4
=4x (2+ 5+ 1)
=32
b) a x 7 + a x 2 + a
=ax (7+ 2+ 1)
=ax 10
a) 4 x 2 + 4 x 5 + 4
=4 x(2+5+1)
=32
b) a x 7 + a x 2 + a
=a x(7+2+1)
=a x10
=a0
a) 4 x 2 + 4 x 5 + 4 = 4 x 5 + 4 x 2 + 4 x 1
= 4 x ( 5 + 2 + 1 )
= 32
b) a x 7 + a x 2 + a = a x 7 + a x 2 + a x 1
= a x ( 7 + 2 + 1 )
= a x 10
Học tốt!!!!!