=

Có từ lâu rồi

7836554

3,45

a) 152 + ( -73 ) – ( -18 ) - 127  

= [152 - ( -18 )] - [127 - ( -73 )]

= ( 152 + 18 ) – ( 127 + 73 )

= 170 - 200

= - 30

b) 7 + 8 + ( -9 ) + ( -10 ). 

= [ (7 + ( -9 ) ] + [ 8 + ( -10 ) ]

= (- (9 – 7) ] + [ - (10 – 8) ]

= ( -2 ) + ( -2 )

= - ( 2 + 2 )

= - 4.

hê lô

10000,0011123

1. If you don't keep silent, you will wake the baby up

2. If you don't stop talking, you won't understand what he is saying

3. If you give me your phone number, I will call you later

4. Unless I help her, she will be sad

5. Unless we have compass, we will get lost

6. If she doesn't have a compass, she will be tired

7. Unless you don't agree with all of the terms, we will sign the contract tomorrow

8. If you don't come to the office early, you will lose your job

9. Unless you can't clean the house, your mother won't have to do it

10. Unless you hurry up, you will miss the train

spell

= ( 1+9 ) + ( 2+8 ) + ( 3+7 ) + ( 4+6 ) + 5

= 10 + 10 + 10 + 10 + 5

= 45