题目内容
计算
+
+
+
+
+
+
+
+
=
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6
6
.分析:先化简分数,原式变为1+
+1+
+
+
+1+
+
,然后运用加法交换律与结合律简算.
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解答:解:
+
+
+
+
+
+
+
+
,
=1+
+1+
+
+
+1+
+
,
=(1+1+1)+(
+
)+(
+
)+(
+
),
=3+1+1+1,
=6.
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=1+
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=(1+1+1)+(
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=3+1+1+1,
=6.
点评:完成此题,应注意分析式中数据,运用运算定律或运算技巧,灵活简算.
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