原式=56.5x9.9+56.5x0.1=56.5x(9.9+0.1)=56.5x10=565 或者:原式=5.65x10x9.9+5.65x1=5.65x(10x9.9+1)=5.65x(99+1)=5.65x100=565
56.5X(9.9+56.5/5.65)
=56.5×(9.9+0.1)=56.5×10=565
56.5*(10-1)+5.65=自己算