题目内容
(5
-2
)+(5
-3
)=( )
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分析:把原式去括号变为5
-2
+5
-3
,然后再根据加法的交换和结合律简算即可.
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解答:解:(5
-2
)+(5
-3
),
=5
-2
+5
-3
,
=5
-3
+5
-2
,
=2+(5
-2
),
=2+3,
=5;
故选:B.
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=5
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=5
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=2+(5
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=2+3,
=5;
故选:B.
点评:此题考查学生灵活运用加法的交换和结合律解答问题
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