1+2+3+...+97+98+99+100=(1+100).100:2=5050
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1+2+3+...+97+98+99+100=(1+100).100:2=5050
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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
1)Tính:
a)100-99+98-97+.............+4-3+2-1
b)99-97+95-93+...............+7-5+3-1
1 + 2 + 3 + .........+ 97 + 98 + 99 +100=?
1+2+3..........+97+98+99+100=
tính
a, 100 - 99 +98 - 97 + .......................... + 4-3+2-1
b, 99 - 97 + 95 - 93 + ............................ + 7-5+ 3-1
Bài 8:
a)100-99+98-97+..+4-3+2-1=?
b)99-97+95-93+...+7-5+3-1=?
1+2+3+4.....+97+98+99+100=?
A= ( 1 + 2 + 3 + 4 + ..........+ 97 + 98 + 99 + 100 ) : 5
Bài 8:Tính tổng
a)100-99+98-97+...+4-3+2-1=
b)99-97+95-93+...+7-5+3-1=