Question

Rezilvati aceste exercitii:
[450:5:(3×6)+35]×7-140+(540:60+7)×(63:9)=
In colonita
Dau coroana

Answer 1

[450:5:(3×6)+35]×7-140+(540:60+7)×(63:9)=
(90:18+35)×7-140+(9+7)×7=
(5+35)×7-140+16×7=
40×7-140+112=
280-140+112=
140+112=
252

Answer 2

[ 450 : 5 : ( 3 × 6 ) + 35] × 7 - 140 + ( 540 : 60 + 7 ) × ( 63 : 9 ) =

= ( 90 : 18 + 35 ) × 7 - 140 + ( 9 + 7 ) × 7 =

= ( 5 + 35 ) × 7 - 140  + 16 × 7 =

= 40 × 7 - 140 + 112 =

= 280 - 140 + 112 =

= 140 + 112 =

= 252

_______________________________

sau dau factor comun pe 7:

= 40 x 7 + 20 x 7 + 16 x 7 =

= 7 × ( 40 - 20 + 16 ) =

= 7 × ( 20 + 16 ) =

= 7 × 36 =

= 252