Question

218+[356+(107×4+35×a)]:38:2:7=220

Answer 1

218 + [ 356 + ( 107 × 4 + 35 × a ) ] : 38 : 2 : 7 = 220

218 + [ 356 + ( 428 + 35 × a ) ] : 38 : 2 : 7 = 220

[ 356 + ( 428 + 35 × a ) ] : 38 : 2 : 7 = 220 - 218

[ 356 + ( 428 + 35 × a ) ] : 38 : 2 : 7 = 2

[ 356 + ( 428 + 35 × a ) ] : 38 : 2 = 2 × 7

[ 356 + ( 428 + 35 × a ) ] : 38 : 2 = 14

[ 356 + ( 428 + 35 × a ) ] : 38 = 14 × 2

[ 356 + ( 428 + 35 × a ) ] : 38 = 28

[ 356 + ( 428 + 35 × a ) ] = 28 × 38

[ 356 + ( 428 + 35 × a ) ] = 1064

428 + 35 × a = 1064 - 356

428 + 35 × a = 708

35 × a = 708 - 428

35 × a = 280

a = 280 : 35

a = 8 => numărul aflat

Answer 2

Răspuns

8 ;

Explicație pas cu pas:

218+[356+(107x4+35xa)]:38:2:7 = 220 ;

[356+(428+35a)]:38:2:7 = 220-218 = 2 ;

[356+(428+35a)]:38:2 = 2x7 = 14 ;

[356+(428+35a)]:38 = 14x2 = 28 ;

356+(428+35a) = 28x38 = 1064 ;

428+35a = 1064-356 = 708  ;

35a = 708-428 = 280 ;

a = 280:35 = 8 ;