99.9×98＋（0.8－3／5）×999,3／5 - 知识问答

99.9×98＋（0.8－3／5）×999,3／5是五分之三

9个回答

99.9×98+(0.8-3/5)×999
=99.9×98+0.2×999
=999×9.8+999×0.2
=999×(9.8+.0.2)
=9990
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