Question

[Na Johnce]

tinh nhanh

1. 1996 + 3012 +5988 + 7004 =

2.1253+ 254 + 2345 - 253 - 154

3. 123 + 456 + 77 +546

4. 50 - 5 - 5 - 5 -5 - 5 - 5 - 5 - 5 - 5 -5 - 5

5. 143 - [ 80 + 43]

Answer 1

[nguyen thi lan huong]

1. 1996 ++ 3012 + 5988 + 7004

= ( 1996 + 7004 ) + ( 3012 + 5988)

= 9000 + 9000

= 18000

2.1253 + 254 + 2345 - 253 - 154

= ( 1253 - 253 ) + ( 254 - 154 )

= 1000 + 100

= 1100

3. 123 + 456 + 77 + 546

= ( 123 + 77 ) + ( 456 + 546)

= 200 + 1002

= 1202

4.50 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5

= 50 - ( 5 x 11 )

= 50 - 55

= -5

5.143 - ( 80 + 43 )

= 143 - 123

= 20

Chúc bạn học tốt!

Answer 2

[lenamkhanh]

1.1996+7004=9000+3012+5988=1800