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Daca 10a+12b =30 afla 15a+18b

Daca 10a+12b=30 afla 15a+18b


Răspuns :

10a+12b=30
2(5a+6b)=30
5a+6b=30/2
5a+6b=15
15a+18b=3(5a+6b)=3x15=45
   
[tex]10a+12b=30 \\ 15a+18b = 1,5 \times 10a + 1,5 \times 12b = 1,5(10a+12b) = 1,5 \times 30 = \boxed{45} [/tex]