數(shù)學(xué)公式=數(shù)學(xué)公式÷數(shù)學(xué)公式=數(shù)學(xué)公式÷數(shù)學(xué)公式=
數(shù)學(xué)公式÷2=數(shù)學(xué)公式÷數(shù)學(xué)公式=數(shù)學(xué)公式數(shù)學(xué)公式=
數(shù)學(xué)公式÷4=20÷數(shù)學(xué)公式=數(shù)學(xué)公式÷數(shù)學(xué)公式=
數(shù)學(xué)公式÷數(shù)學(xué)公式=

解:
=3÷=2÷=
÷2=÷==
÷4=20÷=30÷=15
÷=

分析:依據(jù)分?jǐn)?shù)除法的計(jì)算法則,即“除以一個(gè)數(shù),等于乘這個(gè)數(shù)的倒數(shù)”,據(jù)此即可逐題解答.
點(diǎn)評(píng):此題主要考查分?jǐn)?shù)除法的計(jì)算法則,以及學(xué)生的口算能力.
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