Các câu hỏi tương tự
tinh nhanh 1+2 -3-4+5+6-7-8+...-99-100+101+102
1-2+3-4+5-6+....+99-100+101 tinh nhanh nha
tinh nhanh
a) A= 33(1-2/3)(1-2/5)...(1-2/99)
b) B=101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1
c) C=423134x846267-423133/423133x846267+423134
tinh tong:1/1*3*5+1/3*5*7+......+1/101*103*105
tinh tong:1/1*3*5+1/3*5*7+......+1/101*103*105
tinh nhanh
a)25*100+75*101
b)729+2995
c)325*48
d)1+5+9+13+17+...+81+85
e)B=1*2+2*3+3*4+4*5+...+99*100
tinh nhanh :A=(1-1/2).(1-1/4).(1-1/90)...(1-1/10000)
B=(1/1*3+1).(1/2*4+1).1/3*5+1)...(1/99*101+1)
Tính nhanh
A=2/1*5+2/5*9+2/9*13+...+2/97*101+2/101*105
B=4/2*5+4/5*2+4/8*11+...+4/44*47+4/47*50
C=3/1*3*5+3/3*5*7+3/5*7*9+...+3/19*21*23+3/21*23*25
Tinh
A)1×3+2×5+3×7+4×9+...+50×101
b)1×5+2×7+3×9+4×11+...+50×103