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402+[1002:3-(100+a)×2]:4=408

Răspuns :

402 + [ 1002 : 3 - ( 100 + a ) × 2 ] : 4 = 408

402 + [ 334 - ( 100 + a ) × 2 ] : 4 = 408

[ 334 - ( 100 + a ) × 2 ] : 4 = 408 - 402

[ 334 - ( 100 + a ) × 2 ] : 4 = 6

334 - ( 100 + a ) × 2 = 6 × 4

334 - ( 100 + a ) × 2 = 24

( 100 + a ) × 2 = 334 - 24

( 100 + a ) × 2 = 310

100 + a = 310 : 2

100 + a = 155

a = 155 - 100

a = 55