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a fost răspuns

Calculati, Folosind factorul comun : VA ROG, DAU COROAN!!! Exerciitile : a)36×29+42×36-36×31
b)39×46+25×39-39×21
c) 1111+2222+3333+..999

Răspuns :

BiaBiuBiencuta
a)36x29+42x36-36x31=36x(29+42-31)=36x(71-31)=36x40=1440 b)39x46+25x39-39x21=39x(46+25-21)=39x(71-21)=39x50=1950 c)1111+2222+....+9999=1111x1+1111x2+1111x3+1111x4+....+1111x9=1111x(1+2+3+4+5+...+9)=1111x45=49995

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