Question

3. Calculați
, folosind scoaterea unui factor comun:
a) 8.15 +8. 19;
b) 5. 54 - 5. 17;
d) 7.45 +7.34;
e) 8.62 -8.45;
c) 4.52 +4.21;
f) 6.75 -6.28.
pls, e urgent!​

Answer 1

Răspuns:

8×(15+19)

5×(57-17)

7×(45+34)

8×(62-45)

4×(54+21)

6×(75-28)

Answer 2

Explicație pas cu pas:

a)

8×15+8×19=

8×(15+19)=8×34=272

b)

5×54-5×17=

5×(54-17)=5×37=185

d)

7×45+7×34=

7×(45+34)=7×79=553

e)

8×62-8×45=

8×(62-45)=8×17=136

c)

4×52+4×21=

4×(52+21)=4×73=292

f)

6×75-6×28=

6×(75-28)=6×47=282