Question

Calculează în două moduri: a) (28 +17) × 4 = (35+29) × 6 = (84 - 56) x 8 = b) (136 +219) × 3 = X (372-185) x 5 = (234 + 456) x 7 =​

Answer 1

Răspuns:

a) ( 28 + 17 ) × 4 = 45 × 4

= 180

( 28 + 17 ) × 4 = ( 28 × 4 ) + (17 × 4)

= 112 + 68

= 180

b) ( 136 + 219 ) × 3 = 355 × 3

= 1065

( 136 + 219 ) × 3 = ( 136 × 3 ) + ( 219 × 3)

= 408 + 657

= 1065

( 372 - 185 ) × 5 = 187 × 5

= 935

(372 - 185) × 5 = ( 372 × 5) - ( 185 × 5)

= 1860 - 925

= 935

( 234 + 456) × 7 = 690 × 7

= 4830

( 234 + 456) × 7 = ( 234 × 7 ) + ( 456 × 7 )

= 1638 + 3192

= 4830

Answer 2

a)180
b)1065
c)935
d)4830