56.5×9.9+5.65=56.5×9.9+56.5x0.1=56.5x(9.9+0.1)=56.5x10=565运用乘法分配律
图
56.5×9.9+5.65=56.5X9.9+56.5X0.1 (统一位数)=56.5X(9.9+0.1) (提取公因数)=56.5X10=565