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in doua moduri 40×(20+50)

Răspuns :

M1.40x(20+50)=40x70=2800
M2.40x(20+50)=40x20+40x50=800+2000=2800
Primul mod : 40×(20+50)=40×70=2 800

Al doilea mod : 40×(20+50)=40×20+40×50
=800+2 000=
=2 800