用简便方法计算下列各题:2.25*7又1/5+2.8/4/9

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用简便方法计算下列各题:2.25*7又1/5+2.8/4/9用简便方法计算下列各题:2.25*7又1/5+2.8/4/9用简便方法计算下列各题:2.25*7又1/5+2.8/4/92.25*7又1/5

用简便方法计算下列各题:2.25*7又1/5+2.8/4/9
用简便方法计算下列各题:2.25*7又1/5+2.8/4/9

用简便方法计算下列各题:2.25*7又1/5+2.8/4/9
2.25*7又1/5+2.8/4/9
=9/4×7.2+2.8×9/4
=9/4×(7.2+2.8)
=9/4×10
=45/2
=22.5