(x+2x+3x+.100x )化简
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(x+2x+3x+.100x)化简(x+2x+3x+.100x)化简(x+2x+3x+.100x)化简(x+2x+3x+.100x)=(1+2+3...+100)x=100(100+1)x/2=505
(x+2x+3x+.100x )化简
(x+2x+3x+.100x )化简
(x+2x+3x+.100x )化简
(x+2x+3x+.100x )
=(1+2+3...+100)x
=100(100+1)x/2
=5050x