20+20+20+20+20+20+20+20+320+2+2651=3133
= 20 x 8 + 320 + 2 + 2651
= 160 + 320 + 2 + 2651
= 480 + 2 + 2651
= 482 + 2651
= 3133
mk nhanh nhất
20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 320 + 2 + 2651
= 20 x 8 + 320 + 2 + 2651
= 160 + 320 + 2 + 2651
= 480 + 2 + 2651
= 482 + 2651
= 7633
20+20+20+20+20+20+20+20+320+2+2651
=20x8+320+2+2651
=160+320+2+2651
=480+2+2651
=482+2651
=3133