Bài 1: (2x+6)+2014=2017
=> 2x+6 = 2017-2014
=> 2x+6 = 3
=> 2x = -3
=> x = -3/2
Bài 2: x+2x+3x+.....+100x = 10100
=> x.(1+2+3+......+99+100) = 10100
=> x. 5050 = 10100
=> x = 10100 : 5050
=> x = 2
Vậy x = 2
Bài 1 :
\(48:\left(2x+6\right)+2014=2017\)
\(48:\left(2x+6\right)=2017-2014\)
\(48:\left(2x+6\right)=3\)
\(2x+6=48:3\)
\(2x+6=16\)
\(2x=16-6\)
\(2x=10\)
\(x=10:5\)
\(x=2\)
b) \(x+2x+3x+...+100x=10100\)
\(\Rightarrow1x+2x+3x+...+100x=10100\)
\(\Rightarrow x\cdot\left(1+2+3+...+100\right)=10100\)
\(\Rightarrow x\cdot\frac{\left(100+1\right)\cdot100}{2}=10100\)
\(\Rightarrow x\cdot5050=10100\)
\(\Rightarrow x=10100:5050\)
\(\Rightarrow x=2\)
