Because that’s all any kind of electronic thing can do–math. Anything else they can do, whether it be a calculator or your smart phone is just a lot of math causing other things to happen. And math is just little virtual switches being turned on and off. This makes addition and subtraction really easy and multiplication and division are just shortcuts for addition and subtraction.
Anything else. is just a more complicated way of doing that, so calculators and computers can do any kind of math you give them.
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