Các câu hỏi tương tự
A = 1-2+3-4+5-6+.....+97-98+99-100+101
B = 1+2-3-4+5+6-7-8+......+98-99-100+101
2 + 4 + 6 + 8 .... + 98 + 100 =
2+4+6+8+....+98+100
1/2*4*6+1/4*6*8+1/8*10*12+1/10*12*14+.....+1/96*98*100
(2+4+6+8+10+12+...+98+100)x(100x9-4589-3689)=?
(1+2+3+4+5+6+7+8+9+10).(100-99+98-97+...+1)=
Tính nhanh
a) 27 x 45 + 55 x 27/ 2 + 4 + 6 + 8 + ... + 16 + 18
b) 3737 x 43 - 4343 x 37/ 2 + 4 + 6 + 8 + ... + 98 + 100
1/2+1/4+1/6+1/8...+1/98+1/100
Tổng là?
tính nhanh
a 5+10+15+20+....+250
b 2+4+6+8+....+98+100-(1+3+5+7+...+97+99)