99.9×98+(1-4/5)×999简便计算

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99.9×98+(1-4/5)×999简便计算
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99.9×98+(1-4/5)×999简便计算
99.9×98+(1-4/5)×999
简便计算

99.9×98+(1-4/5)×999简便计算

99.9×98+(1-4/5)×999
=99.9×98+0.2×999
=99.9×98+2×99.9
=99.9×(98+2)
=99.9×100
=9990

99.9×98+(1-4/5)×999
=999×9.8+0.2×999
=999×(9.8+0.2)
=999×10
=9990