< 4Đ > LÀM ĐÚNG MỖI Ý ĐÚNG < 1Đ >.A. 4.52 – 3.23 = 4.25 –...

12: ( 390: [500 – {125 + 35.7}]).

= 12: ( 390: [500 – {125 + 245}]).

= 12: ( 390: [500 – 370 ]).

= 12: ( 390: 130).

= 12: 3 = 4.