This paper will introduce how to quickly calculate complex mathematical formulas to help readers improve the calculation efficiency.

Addition and subtraction of fractions

For the addition and subtraction of fractions, we can first turn fractions into general fractions, and then calculate them. For example, the original formula15 (1) = (-24/6-5/6)+(43/6+21/6) =-33/6+64/6 = 31/6.

Multiplication of fractions

For the multiplication of fractions, we can first multiply the numerator and denominator separately, and then simplify the fractions. For example, (2) the original formula =-8 * 4/9 * 4/9 * 8116 =-8.