a) 399 x 45 + 55 x 399
= 399 x (45 + 55)
= 399 x 100
= 39900
1995 x 1996 - 996
= 3982020 - 996
= 3981024
b) 1996 x 1995 - 996
= 3982020 - 996
= 3981024
1000 + 1996 x 1994
= 1000 + 3980024
= 3981024
c) 637 x 527 - 189
= 335699 - 189
= 335510
526 x 637 + 448
= 335062 + 448
= 335510
Lần sau dùng máy tính mà tính nhá !!!
a) 399 x 45 + 55 x 399 = 399 x (45 + 55) = 399 x 100 = 39900 1995 x 1996 - 996 = 3982020 - 996 = 3981024 b) 1996 x 1995 - 996 = 3982020 - 996 = 3981024 1000 + 1996 x 1994 = 1000 + 3980024 = 3981024 c) 637 x 527 - 189 = 335699 - 189 = 335510 526 x 637 + 448 = 335062 + 448 = 335510
a: \(399\cdot45+55\cdot399=399\cdot100=39900\)
\(1995\cdot1996-996=3981024\)
b: \(1996\cdot1995-996=3981024\)
\(1000+1996\cdot1994=3981024\)
a) 399 x 45 + 55 x 399
= 399 x ( 45 + 55 )
= 399 x 100
= 39 900.
1995 x 1996 - 996
= 3 982 020 - 996
= 3 981 024.
b) 1996 x 1995 - 996
= 3 982 020 - 996
= 3 981 024.
1000 + 1996 x 1994
= 1000 + 3 980 024
= 3 981 024.
c) 637 x 527 - 189
= 335 699 - 189
= 335 510.
526 x 637 + 448
= 335 062 + 448
= 335 510.
d) 677 x 874 + 251
= 591 698 + 251
= 591 949.