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calculati respectand regulile invatate [(75+5) ori9-20] impartit100

Răspuns :

[(75+5)x9-20]:100=
(80x9-20):100=
(720-20):100=
700:100=7
1) 75+5=80
2) 80x9=720
3) 720-20=700
4) 700:100=7