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Iata o idee pentru a calcula mai rapid!Ia aminte la model...
4x51=4x(50+1)=4x50+4x1=4x50+4=200+4=204
8x61=
3x81=


Răspuns :

4x51=4x(50+1)=4x50+4x1=4x50+4=200+4=204

8x61=8×(60+1)=480+8×1=480+8=488

3x81= 3×(80+1)=3×80+3×1=240+3=243
8x61=8x(60+1)=8x60+8x1=480+8=488
3x81=3x(80+1)=3x80+3x1=240+3=243