Question

Calculati: a) 21•4+4•4=. b)39•85+85•72-11•85=. c)24•26+24•25+48•24+24=. d) 117•118+117•2+116-16•166=

Answer 1

Răspuns:

Explicație pas cu pas:

a·b + a·c = a·(b+c)

a) 21·4+4·4=4·(21+4)=4·25=100

b) 39·85+85·72=82·(39+72)=82·111=9102

c) 24·26+24·25+48·24+24=24·(26+25+48+1)=24·100=2400

d) 117·118+117·2+116-16·166=117·(118+2)+116-16·166=117·120+116-16·166=14040+116-2656=14156-2656=11500