B
=-42x100=-4200
Lỗi
476x72+476x28
=476x(72+28)
=476x100
=47 600
25x1357x4
=1357x(25x4)
=1357x100
=135 700
54x342-44x342
=342x(54-44)
=342x10
=3 420
0,093