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有理数加减混合运算的一般步骤是:(1)把减法转化为加法,写成简洁形式;(2)应用加法交换律与结合律,简化运算;(3)求出结果.现举例说明加减混合运算中的一些技巧.一、把符号相同的加数相结合例1计算:(-33)-(-18)+(-15)-(+1)+(+23).解原式=(-33)+(+18)+(-15)+(-1)+(+23)=-33+18-15-
The general steps of rational addition and subtraction mixed operations are: (1) Convert the subtraction to addition and write it into a concise form; (2) Apply the addition commutative law and associative law to simplify the calculation; (3) Find the result. Now illustrate the addition and subtraction mixture. Some of the skills in the operation. First, add the same number of addends to the calculation of Example 1: (-33)-(-18)+(-15)-(+1)+(+23). Solution Type=( -33)+(+18)+(-15)+(-1)+(+23)=-33+18-15-