數(shù)學(xué)公式+數(shù)學(xué)公式=1-數(shù)學(xué)公式=1.4-0.9=0.3-0.7=
0.13=13÷19=數(shù)學(xué)公式×數(shù)學(xué)公式=數(shù)學(xué)公式×數(shù)學(xué)公式=
0÷數(shù)學(xué)公式×數(shù)學(xué)公式=數(shù)學(xué)公式×50%=13.8-6.9-3.1=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：

+=，1-=，1.4-0.9=0.5，0.3-0.7=-0.4；
0.13=0.001，13÷19=，×=，×=；
0÷×=0，×50%=，13.8-6.9-3.1=3.8，×÷×=．

分析：0.3-0.7運(yùn)算的結(jié)果是負(fù)數(shù)；0.13=0.1×0.1×0.1由此求解；0÷×根據(jù)0除以任何非0的數(shù)都得0以及0乘任何數(shù)都得0進(jìn)行計(jì)算；13.8-6.9-3.1根據(jù)連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡(jiǎn)算；×÷×按照從左到右的順序計(jì)算；其它題目根據(jù)運(yùn)算法則直接求解．
點(diǎn)評(píng)：本題考查了基本的運(yùn)算，計(jì)算時(shí)要細(xì)心，注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù)．
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