去括号，很重要，做加减，要用到；如何去，才算好？守法则，第一条；括号前，正负号，去掉时，注意到；正括号，自去掉，括号内，要照抄；第一项，不带号，要自觉，添正号；负括号，要变号，变号时，要公道．说明去括号是一种重要的恒等变形，这种变形在整式加减运算中常常要? Going to the brackets is very important. You need to use additions and subtractions. How to go? Law-abiding, first; before and after parentheses, sign, removed, noticed; brackets, removed, brackets, copying; first, without a number, to consciously, Tim plus sign; negative brackets, To change the number, change the number to be fair. Explain that bracketing is an important type of constant deformation. Is this distortion often required in the addition and subtraction of integers?