Question

549. Calculează:
a) 7 - (9 - 12:2);
b) 17 : [40 - (2 + 3 7));
C) 116 - 2x [(10 + 3) - (2+8)];
d) [(408:4+ 75:3) 3 - 31] x3;
Dau coroană ​

Answer 1

Răspuns:

a)7-(9-12:2)=4

1)12:2=6

2)9-6=3

3)7-3=4

b)17:[40-(2+37)]=17

1)2+37=39

2)40-39=1

3)17:1=17

c)116-2×[(10+3)-(2+8)]

1)10+3=13

2)2+8=10

3)13-10=3

4)2×3=6

5)116-6=110

d)[(408:4+75:3)3-31]×3

1)408:4=102

2)75:3=25

3)102+25=127

3)127×3=381

4)381-31=150

5)150×3=450

sper ca team ajutat

Answer 2

a) 7 - (9 - 6) =
7 - 3= 4

b) 17 : [ 40 - (2 + 37)] =
17 : ( 40 - 39) =
17 : 1 = 17

c) 116 - 2x [(10 + 3) - (2 + 8)] =
116 - 2x (13 - 10) =
116 - 2x 3 =
116 - 6 = 110

d) [(408 : 4 + 75 : 3) 3 - 31] x 3 =
[( 102 + 24 ) 3 - 31 ] x 3 =
( 126 x3 - 31 ) x3 =
( 378 - 31 ) x 3 =
347 x 3 = 1041
Aici am presupus ca e inmultire deoarece nu era semn intre paranteza si 3 dar iti fac si varianta cu inmultire.

[(408:4 + 75:3 ) :3 - 31] x3 =
[ (102 + 24) :3 - 31 ] x 3 =
( 126 :3 -31 ) x3 =
(42 -31) x 3 =
11 x 3 = 33