Question

500减99减1减98减2减97减3减96减4怎样简算

Answer 1

500-99-1-98-2-97-3-96-4=500-(100-1)-1-(100-2)-2-(100-3)-3-(100-4)-4

=500-100+1-1-100+2-2-100+3-3-100+4-4

=500-400=100