Question

Tính bằng cách thuận tiện nhất

1996 x 1001 - 1996                            b.72 x 72 + 72 x 38 – 72 x10

Answer 1

a)1996000

b)7200

Answer 2

1996 x 1001 - 1996      

=1996 x 1001 - 1996 x1

=1996 x(1001-1)=1996 x1000=1996000

.72 x 72 + 72 x 38 – 72 x10

=72 x (72+38-10)=72 x 100=7200

Answer 3

1996 x 1001 - 1996
= 1996 x (1001-1)
= 1996 x 1000
= 1996000

72 x 72 +72 x 38 - 72 x 10
= 72 x (72+38-10)
= 72 x 100
= 7200

Answer 4

Answer 5

1996 x 1001 - 1996

= 1996 x 1001- 1996 x 1

= 1996 x (1001-1)

= 1996 x 1000

= 1996 000

 b.72 x 72 + 72 x 38 – 72 x10

= 72 x (72+38-10)

= 72 x 100

= 7200