100-0.02-1.02-10.02-20.02-30.02的巧算

100-0.02-1.02-10.02-20.02-30.02的巧算

100-0.02-1.02-10.02-20.02-30.02
=100-(1+10+20+30)-0.02x5
=100-61-0.1
=39-0.1
=38.9
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