题目内容
+= | += |
-= | -= |
1-= | +-= |
1-+ |
解:
(1)+,
=,
=;
(2)+,
=,
=,
=1;
(3)-,
=,
=0;
(4)-,
=,
=;
(5)1-,
=-,
=,
=;
(6)+-,
=,
=;
(7)1-+,
=-+,
=,
=.
分析:根据同分母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.
(1)+,
=,
=;
(2)+,
=,
=,
=1;
(3)-,
=,
=0;
(4)-,
=,
=;
(5)1-,
=-,
=,
=;
(6)+-,
=,
=;
(7)1-+,
=-+,
=,
=.
分析:根据同分母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.
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