Cái gì vậy Quoc Tran Anh Le?

(x-1).(y-2)=6

x = 6 - 2 - 1

x = 3

y = 6 : 2 -1

y = 2

Tui nghĩ như thế...

C

D

C

B

D,

78% Nitrogen

21% Oxygen

1% Carbon Dioxide, Argon, Hydrogen, Helium,...

B dài lắm đấy...

25 >>> 15 :d

C = { 5;10;15;20;25;30;35;40;45;50;55;60;65;70;75;80;85;90;95;100;105 }