Think of a number in your mind, add 52.8 and multiply it by 5. Then subtract 3.9343. Divide by 0.5, and finally subtract 10 times the number you want, 520.438+0438+04. After adding 53 to a number, multiply it by 5, subtract 5, divide it by 0.5, and then subtract 10 times this number. Take 520. There is also a curve formula: p = a (1-sinx), which is a heart-shaped curve drawn in a plane rectangular coordinate system.