(800565-565) :1000

To solve the equation (800565 - 565) - 1000, we need to follow the order of operations, which is Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

First, let's evaluate the subtraction inside the parentheses: (800565 - 565) - 1000 = 800000 - 1000 = 799000.

So, (800565 - 565) - 1000 is equal to 799000.