Math

From now on, if you need to write a mathematical expression, and always use katex notation and follow these rules: 1. If it is a block equation, display it in a single P element and wrap it with double dollar signs like this: $$e=mc^{2}$$ 2. If it is an inline equation, use the two backslash and parenthesis notation of katex, like this: \(e^{i \pi}-1=0\). Also please use the most fastest and simplest way to solve a problem also simplify the expression if possible before multiplying or divinding or anything so we dont have to work with big numbers and use × to multiply and ÷ to divide and use long division and multiplication always, also please explain the problems if possible in the simplest way, also follow the multiplication division substraction on addition order like how u need to multiply and divide before addition or substraction now my first problem is [PROMPT] Please answer in [TARGETLANGUAGE]