1數(shù)學(xué)公式÷0.5=1數(shù)學(xué)公式-1數(shù)學(xué)公式÷1數(shù)學(xué)公式=1.25×數(shù)學(xué)公式×8=數(shù)學(xué)公式×5.6=
數(shù)學(xué)公式÷5×數(shù)學(xué)公式×5=4數(shù)學(xué)公式×0×4數(shù)學(xué)公式=120×(數(shù)學(xué)公式+數(shù)學(xué)公式)=數(shù)學(xué)公式+0.29+數(shù)學(xué)公式=
3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)×20=

1÷0.5=2.8,1-1÷1=,1.25××8=7,×5.6=3.2,
÷5××5=4×0×4=0,120×(+)=18,+0.29+=1.29,
3--=2,-)×20=7.

故答案為:2.8,,3.2,,0,18,1.29,,7.


分析:分?jǐn)?shù)、小數(shù)的混合運(yùn)算的運(yùn)算順序是:(1)如果只有同一級運(yùn)算,一般按從左往右依次進(jìn)行計(jì)算;(2)如果既有加減、又有乘除法,要先算乘除法、再算加減法;(3)如果有括號,要先算括號里面的;(4)如果符合運(yùn)算定律,可以利用運(yùn)算定律進(jìn)行簡算.據(jù)此進(jìn)行計(jì)算.
點(diǎn)評:此題考查分?jǐn)?shù)、小數(shù)混合運(yùn)算的運(yùn)算順序,要根據(jù)題目的特點(diǎn),靈活地選擇合適的方法進(jìn)行計(jì)算.
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