vo huyen thao
1999 x 7 + 1999 +1999 x 2
= 1999 x 7 + 1999 x 1 + 1999 x 2
= 1999 x ( 7 + 1 + 2 )
= 1999 x 10 = 19990
1999 x 7 + 1999 + 1999 x 2
= 1999 x ( 7 + 1 + 2 )
= 1999 x 10
= 19990
1999 x 7 + 1999 + 1999 x 2
= 1999 x (7 + 1 + 2)
= 1999 x 10
= 19990
= 1999 x ( 7 + 1 + 2 )
= 1999 x 10
= 19990
1999 x 7 + 1999 + 1999 x 2
= 1999 x ( 7 + 1 + 2 )
= 1999 x 10
= 19990
1999x7+1999+1999x2
=1999x7+1999x1+1999x2
=1999x(7+2+1)
=1999x10
=19990.
= ( 1999 x 7 ) + ( 1999 x 2 ) x 2
= ( 13 993 + 3998 ) x 2
= 17 991 x 2
= 35 982