＝624-196+76＝624+76-196=504
624-(196-76)
=624-196+76
=428+76
=504
195-86-83+196-82-81+201-79-78+202-76+205
=195+196+201+202+205-(86+83+82+81+79+78+76)
=200-5+200-4+200+1+200+2+200+5-(100-14+100-17+100-18+100-19+100-21+100-22+100-24)
=1000-1-(700-135)
=300-1+135
=434
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