题目内容
 + = | - = |  - = |  - = |  - = |
 += |  - = | += | -= | += |
| += | -= | + = | 1-= | += |
1- = |  += |  - = |  -= | + = |
| 解：+=， | -=， | -=， | -=， | -=， |
| +=， | -= ， | += ， | -= ， | +=1， |
+= ， | -=， | +=1， | 1-=， | += ， |
1-= ， | += ， | -=， | -=0， | +=1． |
分析：根据分数加减法的计算方法进行计算．
点评：同分母分数相加减，分母不变，只把分子相加减；
异分母分数相加减，先通分，然后再按照同分母分数加减法进行计算．
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