1, additive associative law, additive distributive law, multiplicative associative law, multiplicative distributive law

2. Split method

For example:1/kloc-0 /×10 =1×10+10.

3, easy to form 1,-1,

/kloc-an integer multiple of 0/0

Give priority to the formulas and combine them.

4. Cracks cancel each other out

Convert the multiplication of fractions into terms whose numerator and denominator can be reduced or added and subtracted.

That's about it.

You can sum up your accumulation in doing the problem.