Question

1. Calculați:c) {[57×28-57×(24:2+57-9×6)]:13-7}:2
d) 299:13-260:13+39×(18-4×2)​

Answer 1

Răspuns:

c) {[57×28-57×(24:2+57-9×6)]:13-7}:2 = 25

{[57×28-57×(12+57-54)]:13-7}:2 =

{[57×28-57×(69-54)]:13-7}:2=

[(57×28-57×15):13-7]:2=

[(1596-855):13-7]:2=

(741:13-7):2=

(57-7):2=

50:2=25

d) 299:13-260:13+39×(18-4×2)=393

299:13-260:13+39×(18-8)=

299:13-260:13+39×10=

23-20+390=

3+390=393