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a+b=40
b+c=25
Afla:
(a-c)•(a+2b+c)=?
Va rog repede, ofer coronaa!!​


Răspuns :

Răspuns:

b=40-25

b=15

a=40-15

a=25

c=25-15

c=10

(25-10)•(25+2•15+10)

=15•(25+30+10)

=15•65

=975

Răspuns:

a+2b=40

2b=40

b=40÷2

b=20

a+20=40

a=40-20

a=20

20+c=25

c=5

(20-5)×(20+20+5)

15×45= 675