Question

Aflati numarul necunoscut c) ( 2×a+2)×3÷4÷7=18

Answer 1

( 2×a+2)×3:4:7=18

( 2×a+2)×3:4=18×7

( 2×a+2)×3:4=126

( 2×a+2)×3=126×4

(2×a+2)×3=504

(2×a+2)=504:3

(2×a+2)=168

2×a=168-2

2×a=166

a=166:2

a=83

Answer 2

Răspuns:

a=83

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