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calculat folosind factorul comun:13×17+13×25-42×11-2×41.

Răspuns :

13×17+13×25-42×11-2×41=13*(17+25)-42*11-2*41=13*42-42*11-82=42*(13-11)-82=42*2-82=84-82=2
13×17+13×25-42×11-2×41=13x(17+25)-42x11-2x41=13x42-42x11-2x41=42x(13-11)-2x41=42x2-2x41=2x(42-41)=2x1=2