a)( 100 - 1^2 ) * ( 100 - 2^2 ) * ( 100 - 3^2 ) * ...... * ( 100 -50^2 )=( 100 - 1^2 ) * ( 100 - 2^2 ) * ( 100 - 3^2 ) * ...... *(100-10^2)....* ( 100 -50^2 )=( 100 - 1^2 ) * ( 100 - 2^2 ) * ( 100 - 3^2 ) * ...... *(0)....* ( 100 -50^2 )=0
b)1^0 + 1^2 + 1^3+ 1^4 +..........+1^99=1+1+1+1+....+1+1+1(có 100 số 1)=100x1=100
Tính:
M=(1-1/2^2).(1-1/3^2).(1-1/4^2)...(1-1/49^2).(1-1/50^2)
N=(3/2-2/2^2).(4/3-2/3^2).(5/4-2/4^2)...(100/99-2/99^2).(101/100-2/100^2)
bài 1
A=1*2*3+2*3*4+3*4*5+...+99*100*101
B=1*3*5+3*5*7+...+95*97*99
C=2*4+4*6+..+98*100
D=1*2+3*4+5*6+...+99*100
E=1^2+2^2+3^2+...+100^2
G=1*3+2*4+3*5+4*6+...+99*101+100*102
H=1*2^2+2*3^2+3*4^2+...+99*100^2
I=1*2*3+3*4*5+5*6*7+7*8*9+...+98*99*100
K=1^2+3^2+5^2+...+99^2
tính tổng
a) 1 - 2 + 3 - 4 + ... + 99 - 100
b) 2 - 4 + 6 - 8 + ... + 48 - 50
c) -1 + 3 - 5 + 7 - ... + 97 - 99
d) 1 + 2 - 3 - 4 + ... + 97 + 98 - 99 -100
Tính tổng:
a) 1+(-2)+3+(-4)+...+19+(-20)
b) 1-2+3-4+...+99-100
c)2-4+6-8+...+48-50
d) -1+3-5+7-...+97-99
e)1+2-3-4+...+97+98-99-100
Tính tổng :
a)1+(-2)+3+(-4)+...+19+(-20)=
b)1-2+3-4+...+99-100=
c)2-4+6-...48-50=
d)(-1)+3-5+7-...+97-99=
đ)1+2-3-4+...+97+98-99-100=
Tính tổng
a) 1 + ( - 2) + 3 + (-4)+......+19 + ( - 20)
b) 1 - 2 + 3 - 4 +........+ 99 - 100
c)2 - 4 +6 - 8 +..........+48 - 50
d) -1+3 - 5 +7 - ............+97 - 99
e) 1+2 - 3 - 4+..........+97+98 - 99 -100
1/. 1 - 2 + 3 - 4 + ...+ 99 - 100
2/. 2 - 4 + 6 - 8 + ... + 48 - 50
3/. 1 + 2 - 3 - 4 + ... + 97 + 98 - 99 - 100
Bài 4: Tính tổng 1) 1 + (-2) + 3 + (-4) + . . . + 19 + (-20) 2) 1 – 2 + 3 – 4 + . . . + 99 – 100 3) 2 – 4 + 6 – 8 + . . . + 48 – 50 4) – 1 + 3 – 5 + 7 - . . . . + 97 – 99 5) 1 + 2 – 3 – 4 + ... + 97 + 98 – 99 - 100
A = 1 . 2 + 2 . 3 + 3 . 4 + ......... + 98 . 99 / 1 + ( 1 + 2 ) + ( 1 + 2 + 3 ) + ........... + ( 1 + 2 + 3 + ...... + 98 )
B = ( 1 / 51 . 52 ) + 1 / 52 . 53 + ...... + 1 / 100 . 101 ) : ( 1 / 1 . 2 + 1 / 2 . 3 + ........ + 1 / 99 . 100 + 1 / 100 . 101
