Ta có: (246+198+234+x):4=TBC.
=>678+x=TBC x 4
Mà: x=TBC-27=>TBC=x+27
=>678+x= 4X x 108
=> 3X=570
=> X=570:3=190.
190 quyen do.minh vua moi lam hom quA
nhung minh khong biet lam the nao ca
190 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo000000
Trung bình 4 ngăn sách là:
( 246 + 198 + 234 - 27 ) : 3 = 217 ( quyển sách )
Số sách ngăn thứ tư là:
217 - 27 = 190 ( quyển sách )
Đáp số: 190 quyển sách
190
đúng 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
190 quyển sách