( x + 1) + (x + 2) + (x+3) +…+ (x + 100) = 7450
=> x + 1 + x + 2 + x + 3 + ... + x + 100 = 7450
=> (x + x + x + .... + x) + (1 + 2 + 3 + ... + 100) = 7450
=> 100x + 5050 = 7450
=> 100x = 1400
=> x = 14
1 x 2 + 2 x 3 + 3 x 4 + ... + 100 x 101 =
1 x 2 x 3 + 2 x 3 x 4 + ... + 100 x 101 x 102
Có cả lời giải nhé
1/Tìm x,biết:
a)x+(x+1)+(x+2)+(x+3)+...+(x+99)+(x+100)=5555
b)1+2+3+4+...+x=820
c)3(x+1)=9.27
d)x+2x+3x+...+99x+100x=15150
e)(x+1)+(x+2)+(x+3)+...+(x+100)=205550
f)3x+3x+1+3x+2=351
Bài 6 Tìm x
1) ( x+1 ) + ( x+2 ) + ( x+3 ) + ... + ( x+100 ) = 5750
2) ( 2x-1 ) + ( 4x-2 ) + ... + ( 200x - 100 ) = 5050
3) ( x+2 ) + ( x+4 ) + ( x+6 ) + ... + ( x + 100) = 2650
(10 X 20 X 30 X ... X 100)+(1 + 2 + 3 + ... + 100)-(-1 + -2 + -3 + ... + -25) = x (xϵZ)
1 x 100 + 2 x 99 + 3 x 98 + .....+ 99 x 2 + 100 x 1 = ?
Tìm X
A. (X +1)+(X+2)+(X+3)+…+(X+ 100)=5750
B. X+(1+2+3+4+…+50)=2000
C. (X-1)+(X-2)+…+(X-100)=50
tìm x thuộc Z
a)1+2+3+.........+x=5050
b)1/2+1/6+........1x2+x=99/100
c)1/6+1/12+.......1/x2-x=59/100
d)x-2017+x-2016+.........+99+100=0
g)x-1+x-2+x-3+.......x-2017=0
Cho x1+x2+x3+...+x100+x101=0. Biết x1+x2=x3+x4=...=x99+x100=x100+x101=1. Tính x100
Tính:[100-1]x[100-2]x[100-3]x...x[100-n]
Tính
a) ( 100 -1^2 ) x ( 100 - 2^2 ) x ( 100 - 3^2 ) x ...x (100 - 19^2)
b ) ( 169 - 1^2 ) x ( 169 - 2^2 ) x ( 169 - 3^2 ) x ... x (100 - 19^2 )
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