Fill half a box, that is, 1+ 1 = 2 * * * plus 2.5 Tian Zige. The number is indomitable spirit, the horizontal line of the symbol is pressed on the center line, and the equal sign is pressed on the center line, 2mm upward.

How to write "0": find the upper left grid and start writing at a slightly right position in the middle of the upper edge line; Obliquely bend to the left, draw to the lower left frame, and stick it above the middle of the left line; Then bend down to the right and draw to the left in the middle of the bottom line; Bend to the right again until the upper left grid is attached to the lower position in the middle of the vertical center line; Then bend to the left and return to the pen to collect the pen.

brief introduction

Subtraction is a mathematical operation that represents the operation of removing an object from a collection. Its symbol is the minus sign (? )。 For example, in the picture on the right, there are five? Two apples, five apples, two were taken away, leaving three apples. So 5? 2 = 3。 Subtraction is to remove or reduce physical quantities and abstract quantities with different objects (including negative numbers, fractions, irrational numbers, vectors, decimals, functions and matrices).