题目内容
 = |  = |  = |
 = |  = |  = |
 = |  = |  = |
 = |  = |  = |
解：
| =1， | =0， | = ， |
= ， | =1， | = ， |
= ， | = ， | =1， |
= ， | = ， | = ． |
分析：根据分数加减法的计算方法进行计算．
点评：口算时，注意运算符号和数据，然后再进一步计算．
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相关题目
用竖式计算．
| 8.1÷7.2= | 4.56×0.28= |
分析：根据分数加减法的计算方法进行计算．
点评：口算时，注意运算符号和数据，然后再进一步计算．
题目内容
| = | = | = |
| = | = | = |
| = | = | = |
| = | = | = |
解：
| =1， | =0， | =， |
| =， | =1， | =， |
| =， | =， | =1， |
| =， | =， | =． |
| 8.1÷7.2= | 4.56×0.28= |
等于乙数的
，（甲乙两数都不等于0），则甲：乙=