化简 x+2x+3x+...+100x
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化简 x+2x+3x+...+100x
x+2x+3x+...+100x
=x(1+2+3+…100)
=x{[(1+100)100]/2}
=x*(101*50)
=5050x
提取x,这道题就是求1+2+3+4......+100
=5050x
是等差数列[(1+100)*100/2]X
化简 x+2x+3x+...+100x
x+2x+3x+...+100x
=x(1+2+3+…100)
=x{[(1+100)100]/2}
=x*(101*50)
=5050x
提取x,这道题就是求1+2+3+4......+100
=5050x
是等差数列[(1+100)*100/2]X