Question

要用简便算法：41.2×8.1+9 1/4+53.7×1.9 9 1/4=九又四分之一

1.9和9 1/4是分开的，9 1/4=九又四分之一是备注

Answer 1

41.2×8.1+9又 1/4+53.7×1.9
=41.2×8.1+9.25+（41.2＋12.5）×1.9
=41.2×8.1+41.2×1.9＋12.5×1.9+9.25
=41.2×（8.1＋1.9）＋1.25×19+1.25＋8
=41.2×10＋1.25×（19＋1）＋8
=412＋8＋1.25×20
=420＋25
=445

Answer 2

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