Question

1 Evidenţiind factorul comun, efectuati: a 3.12-3.2; b 4.23 4. 11; d 17.15-15.7; e 5 18 +52; 7.49 +7.31 -7.50; 19. 11+30 - 11 - 11 - 16. ​

Answer 1

Explicație pas cu pas:

a)3•(12-2)=3•10=30

b)4•(23-11)=4•12=48

la b nu ai pus semn,eu am presupus ca e minus

d)15•(17-7)=15•10=150

e)5•(18+2)=5•20=100

f)7•(49+31-50)=7•30=210

g)11•(19+30-16)=11•33=363

Succes!

Answer 2

Răspuns:

a) 3 × 12 - 3 × 2 = 3 × (12 - 2) = 3 × 10 = 30

b) Nu ai scris corect semnul, am facut ambele variante

4 × 23 - 4 × 11 = 4 × (23 - 11) = 4 × 12 = 48

4 × 23 + 4 × 11 = 4 × (23 + 11) = 4 × 34 = 136

d) 17 × 15 - 15 × 7 = 15 × (17 - 7) = 15 × 10 = 150

e) 5 × 18 + 5 × 2 = 5 × (18 + 2) = 5 × 20 = 100

f) 7 × 49 + 7 × 31 - 7 × 50 = 7 × (49 + 31 - 50) = 7 × 30 = 210  

g) 19 × 11 + 30 × 11 - 11 × 16 = 11 × (19 + 30 - 16) = 11 × 33 = 363