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daca x=3 si a+b=9, calculati

a) 2a+2b+2x b) 10x - (2a+2b) c) x+8a+8b d) xa+xb e) (3a+3b-2x) x (2a+2b-3x) ajutor va rog


Răspuns :

Succes! Spor la scris!
Vezi imaginea RALUK81
x = 3
a+b = 9 

a) 2a+2b+2x = 2x9 + 2x3 = 18+6 = 24.
b) 10x3 - (2a+2b) = 30 - 18 = 12.
c) 3 + 8a+8b = 3 + 8x9 = 3 + 72 = 75.
d) xa+xb = 3a+3b = 3x9 = 27.
e) (3a+3b-6) x (18 - 9) = (27 - 6) x 9 = 21 x 9 = 189.