Question

Giúp mik với ạ

Answer 1

1.

$=-5-18-9+3=3-(5+18+9)=3-32=-29$

2. 

$=-4+8-15-10=8-(4+15+10)=8-29=-21$

3.

$=-7+12-9+10=(10-7)+(12-9)=3+3=6$

4.

$=16+3-5-7+12=(16+3)+(12-5-7)=19+0=19$

Answer 2

5.

$=-11+15-13-9-5=15-(11+13+9+5)=15-38=-23$

6.

$=4+12-5+19$

$=(4+12+19)-5=(16+19)-5=25-5=20$

7.

$-(28-30+4)=-28+30-4=30-28-4=2-4=-2$

8.

$=13-17+15+3-4+8-9$

$=(13+15+3+8)-(17+4+9)$

$=39-30=9$