题目内容
7
÷
-2
×
.
解:7
÷
-2
×
=
×
-
×
,
=30-2,
=28.
分析:本题根据四则混合运算的运算顺序计算即可:先算除法与乘法,再算减法.
点评:在四则混合运算中,加减法为一级运算,乘除法为二级运算.如果算式中同时含有一级与二级运算,要先算二级运算,再算一级运算,即先算乘除,再算加减.如果只含有同级运算,按从左到右的顺序计算即可.

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
=


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
=30-2,
=28.
分析:本题根据四则混合运算的运算顺序计算即可:先算除法与乘法,再算减法.
点评:在四则混合运算中,加减法为一级运算,乘除法为二级运算.如果算式中同时含有一级与二级运算,要先算二级运算,再算一级运算,即先算乘除,再算加减.如果只含有同级运算,按从左到右的顺序计算即可.

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