(1.65×2+1.56×3×
4
5
-
9
50
)×0.3÷0.5
分析:通過觀察,把分?jǐn)?shù)化為小數(shù)計算較簡便.先算括號內(nèi)的乘法,然后括號內(nèi)從左往右依次計算,最后算括號外的乘除,解決問題.
解答:解:(1.65×2+1.56×3×
4
5
-
9
50
)×0.3÷0.5
=(1.65×2+1.56×3×0.8-0.18)×0.3÷0.5
=(3.3+3.744-0.18)×0.3÷0.5
=6.864×0.3÷0.5
=2.0592÷0.5
=4.1184.
點評:此題通過數(shù)字轉(zhuǎn)化,按照運算順序和運算法則,解決問題.
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