Question

Calculati

a)3•9+8•5+10•9

b)21•91+29•91+100•91

c)36•56+56•4+100•64

d)2015•2014+2015•1-2015•2015

Answer 1

Răspuns:

$a)3 \times 9 + 8 \times 5 + 10 \times 9 = \\ = 27 + 40 + 90 \\ = 67 + 90 \\ = 157$

$b)21 \times 91 + 29 \times 91 + 100 \times 91 = \\ = 1911 + 2639 + 9100 \\ = 4550 + 9100 \\ = 13650$

$c)36 \times 56 + 56 \times 4 + 100 \times 64 = \\ = 2016 + 224 + 6400 \\ = 2240 + 6400 \\ = 8640$

$d)2015 \times 2014 + 2015 \times 1 - 2015 \times 2015 = \\ = (2015 \times 2014 - 2015 \times 2015) +2015 \\ = 2015 + 2015 \\ = 4030$