39數(shù)學公式×0.7+65數(shù)學公式×4.18

×0.7+×4.18，
=×0.7+×4.18，
+，
=，
=300．
分析：這兩個分數(shù)的分母相同，先把帶分數(shù)化成假分數(shù)，再按運算順去做即可．
點評：此題考查帶分數(shù)的分母相同，可把帶分數(shù)化成假分數(shù)直接計算．
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