Question

Calculați în două moduri:
21×(36+79)=
15×(55+75-10)=
27×(567-456)=
135×(13+11+1-20)=
20×(139378-138288)=
(68+42)×96=
REPEDE PLZZZ​

Answer 1

Explicație pas cu pas:

21•115=2415

21•36+21•79=756+1659=2415

15•120=1800

15•55+15•75-15•10=825+1125-150=1800

27•111=2775

27•567-27•456=15309-12312=2775

135•7=945

135•13+135•11+135-135•20=1755+1485+135-2700=945

20•1090=21800

20•139378-20•138288=2787560-2765760=21800

110•96=10560

96•68+96•42=6528+4032=10560