Aplicația este accesibilă de pe ecrane late

În expresia 672 ∙ 347 + 672 ∙ 653 factorul comun este:
A: nu există
B: 653
C: 672
D: 347
Regula de scoaterea a factorului comun în afara parantezelor este:
A: a ⋅ b + a ⋅ c = (b + c)+a
B: a ⋅ b + a ⋅ c = a ⋅ (b + c)
C: a ⋅ b + c = a ⋅ (b + c)
D: b + c = a ⋅ (b + c)
Regula de deschiderea paran tezelor este:
A: a ⋅(b + c) = a + a ⋅ c
B: a ⋅(b + c) = a ⋅b + c
C: a ⋅(b + c) = a ⋅b + a ⋅ c
D: a ⋅(b + c) = b + c
În expresia 12 ⋅ (54 + 66), vom deschide parantezele astfel:
A: 12 ⋅ (54 + 66)=12 ⋅ 54 + 66
B: 12 ⋅ (54 + 66)=54 + 66
C: 12 ⋅ (54 + 66)=12 ⋅ 120
D: 12 ⋅ (54 + 66)=12 ⋅ 54 + 12 ⋅ 66
În expresia 58 ⋅ (78 - 7), vom deschide parantezele astfel:
A: 58 ⋅ (78 - 7)= 58 ⋅ 78 - 58 ⋅ 7
B: 58 ⋅ (78 - 7)= 78 - 58 ⋅ 7
C: 58 ⋅ (78 - 7)=58 ⋅ 78 + 58 ⋅ 7
D: 58 ⋅ (78 - 7)=58 ⋅ 78 - 7
În expresia 3 ⋅10 − 3 ⋅ 4 − 3 ⋅ 2 vom scoate factorul comun astfel:
A: 3 ⋅10 − 3 ⋅ 4 − 3 ⋅ 2= 3 ⋅ (10 +4 - 2)
B: 3 ⋅10 − 3 ⋅ 4 − 3 ⋅ 2= 3 ⋅ (10 - 4 +2)
C: 3 ⋅10 − 3 ⋅ 4 − 3 ⋅ 2= 3 ⋅ (10 - 4 - 2)
D: 3 ⋅10 − 3 ⋅ 4 − 3 ⋅ 2= 3 ⋅ 4
Scoateţi factorul comun în afara parantezelor, apoi calculaţi: 12⋅ 91−12⋅ 88 −12⋅2;
A: 12⋅ 91−12⋅ 88 −12⋅2=12⋅ (91 - 88 +2)=60
B: 12⋅ 91−12⋅ 88 −12⋅2=12⋅ (91 - 88 - 2)=0
C: 12⋅ 91−12⋅ 88 −12⋅2=12⋅ (91 + 88 - 2)=2124
D: 12⋅ 91−12⋅ 88 −12⋅2=12⋅ (91 - 88 - 2)=12