1+2-3-4+5+6-7-8+9+10-11-12+.....-299-300+301+302
=1+(2-3)+(-4+5)+(6-7)+(-8+9)+(10-11)+... +(-300+301)+302
= 1-1+1-1+1-1+...-1+302
= 302
Học tốt
@Trung
302 nha bạn hok tốt
Các câu hỏi tương tự
1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302
1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302
1+2-3-4+5+6-7-8+9+10-11-12+..........-299-300+301+302
1+2-3-4+5+6-7-8+9+10-11-12+....-299-300+301-302
B=1+2-3-4+5+6-7-8+9+10-11-12+.........-299-300+301+302 = ?
B= 1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302
1+2-3-4+5+6-7-8+9+10-11-12+........+298-299-300+301+302 = ?
tính:
1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302.
Tinh nhanh: M=1+2-3-4+5+6-7-8+9+10-11-12+...+...298-299-300+301+302