1+2+3+...+(x-1)+x=5050
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=> x+1+x+2+x+3+...+x+100=5050
=> (x+x+...+x)+(1+2+3+...+100)=5050
=> 100*x+5050=5050
=> 100*x=5050-5050
=> 100*x=0
=> x=0:100
=> x=0
\(5\left(x-1\right)+3=43\)
\(5\left(x-1\right)=40\)
\(x-1=8\)
\(x=9\)
\(\left(1+2+3+...+50\right)+x=5050\)
\(\dfrac{50\left(50+1\right)}{2}+x=5050\)
\(1275+x=5050\)
\(x=3775\)
\(\left(2x+1\right)^3=64\)
\(\left(2x+1\right)^3=4^3\)
\(2x+1=4\)
\(2x=3\)
\(x=1,5\)
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) = 5050
100x + 101.100 : 2 = 5050
100x + 5050 = 5050
100x = 0
x = 0
(x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 5050
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 100) = 5050
100 số x
100.x + (1 + 100).100:2 = 5050
100.x + 101.50 = 5050
100.x + 5050 = 5050
=> 100.x = 0
=> x = 0
Ủng hộ mk nha ^_-
100x + (1+2+3+4+...+100) = 5050
100x + { [ ( 100-1):1+1 ] . [ (100+1):2 ] } = 5050
100x + 5050 = 5050
100x = 0
=> x =0
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) = 5050
=> ( x+x+.... +x)+(1+2+3+4+5+....+100)
tổng 1+2+3+4+....+100=5050
=> x=0
(x+1) + (x+2) +....+(x+100) = 5050
100 x X + ((100+1) x 100 : 2) = 5050
100 x X + 5050 = 5050
100 x X = 0
=> x = 0
(X+1)+(X+2)+(X+3)+...+(X+100)=5050
=>(X+X+X+...+X)+(1+2+3+...+100)=5050
=>100X+[(1+100)x100:2)]=5050
=>100X+(101x100:2)=5050
=>100X+(10100:2)=5050
=>100X+5050=5050
=>100X=5050-5050
=>100X=0
=>X=0:100
=>X=0
Đặt \(A=1+2+...+x\)
Tổng A có số số hạng là:
\(\left(x-1\right):1+1=x\)(số)
Tổng A theo x là:
\(\frac{x\left(x+1\right)}{2}=\frac{x^2+x}{2}\).Thay A vào ta được:
\(\frac{x^2+x}{2}=5050\)\(\Rightarrow x^2+x=10100\)
\(\Rightarrow x^2+x-10100=0\)
\(\Rightarrow x^2+101x-100x-10100=0\)
\(\Rightarrow x\left(x+101\right)-100\left(x+101\right)=0\)
\(\Rightarrow\left(x-100\right)\left(x+101\right)=0\)
\(\Rightarrow\left[\begin{array}{nghiempt}x-100=0\\x+101=0\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=100\\x=-101\end{array}\right.\)
Thay x=-101 thấy không thỏa mãn
Vậy x=100
\(1+2+3+...+x=5050\)
\(\Rightarrow\frac{x\left(x+1\right)}{2}=5050\)
\(\Rightarrow x\left(x+1\right)=5050.2=10100\)
\(\Rightarrow x\left(x+1\right)=100.101\)
\(\Rightarrow x=100\)
(X + 1) + (X + 2) + (X + 3) + … + (X + 99) + (X +100) = 5050
(X+X+X+...+X+X) + (1+100) x 50 = 5050
100 x X + 101 x 50 = 5050
100 x X + 5050 = 5050
100 x X = 5050 - 5050
100 x X = 0
X= 0: 100
X= 0
100x+(1+2+3+...+100)=5050
100x+5050=5050
100x=5050-5050
100x=0
x=0:100
x=0
Ta có:\(1+2+3+...........\left(x-1\right)+x=5050\)
\(\Rightarrow\frac{x\left(x+1\right)}{2}=5050\Rightarrow x\left(x+1\right)=10100=100.101\)
\(\Rightarrow x=100\).
Vậy.......