A. 5+(3-(5(-4)+2)-10=

Bismilahirrahmanirrahim

5+(3-(5(-4)+2)-10
5+0-10
=5-10
=-5
maaf kalau salah

5+(3-(5(-4)+2)-10
= 5+(3-(-20)+2)-10
= 5+(3+20+2)-10
= 5+25-10
= 20

Semoga membantu dan bisa dipahami..