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A)4×(3+1+2)=
MODUL 1) (CALCULAM PARANTEZA)
4×(3+1+2)=
4×6=
24.
MODUL 2) (DESCHIDEM PARANTEZA)
4×(3+1+2)=
4×3+4×1+4×2=
12+4+8=
24.
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6×(2+1+4)=
MODUL 1) (CALCULAM PARANTEZA)
6×(2+1+4)=
6×7=
42
MODUL 2) (DESCHIDEM PARANTEZA)
6×(2+1+4)=
6×2+6×1+6×4=
12+6+24=
42
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6×(7-2-1)=
MODUL 1) (CALCULAM PARANTEZA)
6×(7-2-1)=
6×4=
24
MODUL 2) (DESCHIDEM PARANTEZA)
6×(7-2-1)=
6×7-6×2-6×1=
42-12-6=
24
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9×(7-2+4)=
MODUL 1) (CALCULAM PARANTEZA)
9×(7-2+4)=
9×9=
81
MODUL 2) (DESCHIDEM PARANTEZA)
9×(7-2+4)=
9×7-9×2+9×4=
63-18+36=
81
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b) (2+1+3)×3=
MODUL 1) (CALCULAM PARANTEZA)
(2+1+3)×3=
5×3=
15
MODUL 2) (DESCHIDEM PARANTEZA)
(2+1+3)×3=
6×3=
18.
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(2+3+4)×7=
MODUL 1) (CALCULAM PARANTEZA)
(2+3+4)×7=
9×7=
63.
MODUL 2) (DESCHIDEM PARANTEZA)
(2+3+4)×7=
2×7+3×7+4×7=
14+21+28=
63.
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(6-2+3)×8=
MODUL 1) (CALCULAM PARANTEZA)
(6-2+3)×8=
7×8=
56
MODUL 2) (DESCHIDEM PARANTEZA)
(6-2+3)×8=
6×8-2×8+3×8=
48-16+24=
56
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(8-2-3)×7=
MODUL 1) (CALCULAM PARANTEZA)
(8-2-3)×7=
3×7=
21
MODUL 2) (DESCHIDEM PARANTEZA)
(8-2-3)×7=
8×7-2×7-3×7=
56-14-21=
21.
