解:56.5x9.9+5.65
=56.5x9.9+56.5X0.1
=56.5×(9.9+0.1)
=56.5×10
=565
56.5*9.9+5.65
=56.5*9.9+56.5*0.1
=56.5*(9.9+0.1)
=56.5*10
=565
希望对你有所帮助……
56.5x9.9+5.65
=56.5x(10-0.1)+5.65
=56.5ⅹ10-56.5x0.1+5.65
=565-5.65+5.65
=565
这道题可以运用乘法分配律使计算简便
56.5x9.9+5.65
=5.65x10x9.9+5.65
=5.65×(10x9.9+1)
=5.65×100
=565
56.5x9.9+5.65
=56.5x9.9+56.5x0.1
=56.5×(9.9+0.1)
=56.5×10
=565