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(2xa+2)x3:4:7 =18 (Afla valoarea lui a)

Răspuns :

(2a+2)x3:4 = 126   (2a+2)x3= 504  2a+2=168  2a=166 a=83
(2a+2)x3:4:7=18. (2a+2)x3:4 =18x7. (2a+2) x3:4=126. (2a+2)x3=126x4. (2a+2)x3=504. 2a+2= 504:3. 2a+2=168. 2a= 168-2. 2a= 166. a= 166:2. a= 83