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Ştiind ca x+y+13 =24,determinați 19+2×y+2×x

Răspuns :

x+y+13=24 ⇒ x+y=24-13, x+y=11

19+2x+2y=2(x+y)+19=2x11+19=22+19=41
x + y + 13 =24
x + y = 24 - 13
x + y = 11
19 + 2y + 2x =
19 + 2(x + y) = 
19 + 2 * 11 =
19 + 22 =
41