0.36+0.4=4.8×數(shù)學(xué)公式=1.5÷0.1=10×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÷數(shù)學(xué)公式=數(shù)學(xué)公式×21×數(shù)學(xué)公式=
數(shù)學(xué)公式=數(shù)學(xué)公式=

解:0.36+0.4=0.76; 4.8×=1.8; 1.5÷0.1=15; 10×=8;
×=; -=; ÷=5; ×21×=4.2;
+)×==
分析:①注意小數(shù)點(diǎn)對(duì)齊;②④⑧注意約分;③把被除數(shù)和除數(shù)同時(shí)擴(kuò)大10倍;⑤把分子相乘的積做分子,分母相乘的積做分母;⑥通分計(jì)算;⑦除以一個(gè)數(shù)等于乘這個(gè)數(shù)的倒數(shù);⑨先算括號(hào)內(nèi)的,再算括號(hào)外的;⑩把除法改為乘法,運(yùn)用乘法分配律簡(jiǎn)算.
點(diǎn)評(píng):此題考查了小數(shù)點(diǎn)的位置、約分、通分、分?jǐn)?shù)乘法、分?jǐn)?shù)除法、運(yùn)算順序、運(yùn)算定律等知識(shí).
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