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1×2-[10-7-(x:7:4)+5×2]:8=0
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Răspuns :

2 - [ 17 - ( x ÷ 7 ÷ 4 ) + 10 ] ÷ 8 = 0

2 - ( 27 - x/7 × 4 ) ÷ 8 = 0

2 - ( 27 - x/28/8 ) = 0

2/1 - 27 × 28 - x/8 × 28 = 0

2/1 - 756 - x/224 = 0

756 - x/224 = 2  

756 - x = 2 × 224

756 - 448 = x

x = 308