Tìm x: a, x : 6 x 4 = 1,248 b, x : 5 - 8,6 = 0,4

a, x:6×4=1,248x:6=1,248:4x:6=0,312x        =0,312×6x        =1,872b, x:5−8,6=0,4x:5             =0,4+8,6x:5             =9x                   =9×5x                   =45