56.5×9.9+5.65=5.65×99+5.65=5.65×（99+1）=5.65×100=565
=5.65*99+5.65=5.65(99+1)=5.65*100=565
565
56.5×9.9+5.65=56.5×9.9+56.5×0.1=56.5×10=565
