[2.1+7÷(2-0.625)]×1
解:[2.1+7÷(2
-0.625)]×1
,
=[2.1+7÷
]×1
,
=[2.1+
]×1
,
=
×1
,
=
.
分析:先算小括號里面的減法,再算中括號里面的除法,再算中括號里面的加法,最后算括號外的乘法.
點評:一個算式里,如果有括號,要先算小括號里的,再算中括號里面的,最后算括號外的.
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