a) \(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+......+50+x=1275\)
\(\Rightarrow50x+\left(1+2+3+4+......+50\right)=1275\)
\(\Rightarrow50x+1221=1275\)
\(\Rightarrow50x=54\)
\(\Rightarrow x=\frac{27}{25}\)
b) \(x+2x+3x+.......+100x=10100\)
\(\Rightarrow x\left(1+2+3+.....+100\right)=10100\)
\(\Rightarrow5050x=10100\)
\(\Rightarrow x=2\)
Tim x c N, biet :
a/. ( x + 1) + ( x + 2 ) + ( x + 3 )......+ 50x = 1275
b/. x + 2x + 3x +...... + 100x = 10100
giup minh nhe minh se tick cho !!!
giup minh nha giai day du minh 3 tick cho
tim x biet(x-1)+(x-2)+..+(x-2014)
a) 2x+48=60
b)3.(x+5)+8=80
c)2x+3x=50
d)x+2x+3x+.........+99x+100x=10100
e)x.(x+2)=0
tim so tu nhien x,biet
a, 2x+3x=1505
b,1+35+...+x=3200(xla so le)
c,(x+1)+(X+2)+(x+3)+....+(x+100)=5750
giup minh voi mai minh can roi
cam on cac ban nhieu lam
Tim x, y va z, biet :
a) x/2 = y/3 = z/4 va x + y + z =18.
b) x/5 = y/-6 = z/7 va x + y - z =32.
c) x/5 = y/3 = z/2 va 2x + 3y + 4z =54.
d) x/2 = y/3 = z/6 va 3x - 2y + 2z = 24.
Ai biet thi chi giup minh nha. Cang nhanh cang tot ! Minh xin cam on.
Tim x c N, biet :
a, 150 + ( x - 137 ) = 260
b, 287 : ( 20- x ) = 41
c, x + 135 : 5 = 61
d, x + 2x + 3x + .......... + 30x = 465
e, ( x + 1 )+ ( x + 2 ) + ( x + 3 ) + ......+ ( x + 45 ) = 103
moi nguoi giup minh nha, minh dang can gap lam ! cam on nhieu !
tìm x thuộc N biết : x + 2x + 3x +...+100x =10100
a) tim so nguyen x sao cho : 4x+5 chia het cho 2x-1
b) tim so nguyen x va y biet : xy+3x-2y -11 = 0
giup mik nha ! ai nhanh nhat mik tick cho !
tìm số tự nhiên x biết : x+2x+3x+4x+...+100x = 10100
