Question

1. Deschideti parantezele, apoi calculati: a) 4 (6 +9); b) (6 +8). 7; c) 3 (7 +8+5); 5-(7-3); (10-2).9, (2+6+9) 4; d) 2(8-3-2) e) 9 (8+4-7); (10-5-3) 6. (5-2 +9) 3. ​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 4 x ( 6 + 9)= 60

4 x 6 + 4 x 9 =
24 + 36=
= 60

b) ( 6 + 8 ) x 7=98
6 x 7 + 8 x 7 =
42 + 56 =

= 98

c) 3 x ( 7 + 8 + 5) = 60

3 x 7 + 3 x 8 + 3 x 5=
21 + 24 + 15 =
45 + 15 =

= 60

5 x ( 7 - 3 )=20

5 x 7 - 5 x 3=
35 - 15 =
= 20

( 10 - 2 ) x 9 = 72

10 x 9 - 2 x 9 =
90 - 18 =
= 72

( 2 + 6 + 9 ) x 4= 68

2 x 4 + 6 x 4 + 9 x 4 =
8 + 24 + 36=

32 + 36 =
= 68

d) 2 x ( 8 -3 - 2 ) = 6

2 x 8 - 2 x 3 - 2 x 2 =
16 - 6 - 4=
10 - 4 =

= 6

e) 9 x ( 8 + 4 - 7 ) = 45

9 x 8 + 9 x 4 - 9 x 7=
72 + 36 - 63 =
108 -63 =
= 45

( 10 - 5 - 3 ) x 6 = 12

10 x 6 - 5 x 6 - 3 x 6 =
60 - 30 - 18=
30 - 18 =
= 12

( 5 - 2 + 9 ) x 3= 36

5 x 3 - 2 x 3 + 9 x 3 =

15 - 6 + 27=
9 + 27=

= 36