2數(shù)學公式÷[5數(shù)學公式-4.5×(20%+數(shù)學公式)].

解:2÷[5-4.5×(20%+)],
=2÷[5-4.5×],
=2÷[5-2.4],
=2÷3,
=
分析:先算小括號里面的加法,再算中括號里面的乘法,再算中括號里面的減法,最后算除法.
點評:四則運算,先弄清運算順序,然后再進一步計算即可;能簡算的要簡算.
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