4.5+5.5=0.43×100=9.8-4.8=2.5÷100=
0.7+0.23=100÷1000=3.4×0.2=0.9-0.09=
0.8×6=0,5×0.1=1÷0.5=5,6÷1=
32-6=2.75+1.25=2.5×4=1.25×8=
0.81÷3÷3=600÷25÷4=0.125×32×8=1.7×0.25×4=

解:4.5+5.5=10,0.43×100=43,9.8-4.8=5,2.5÷100=0.025,
0.7+0.23=0.93,100÷1000=0.1,3.4×0.2=0.68,0.9-0.09=0.81,
0.8×6=4.8,0.5×0.1=0.05,1÷0.5=2,5.6÷1=5.6,
32-6=3,2.75+1.25=4,2.5×4=10,1.25×8=10,
0.81÷3÷3=0.09,600÷25÷4=6,0.125×32×8=32,1.7×0.25×4=1.7.
故此題答案為:10,43,5,0.025,0.93,0.1,0.68,0.81,4.8,0.05,2,5.6,3,4,10,10,0.09,6,32,1.7.
分析:0.43×100把0.43的小數(shù)點(diǎn)向右移動(dòng)2位即可;32-6表示3×3-6,所以要先算32,再算減法;0.81÷3÷3,600÷25÷4,根據(jù)瀨尿蝦除以?xún)蓚(gè)數(shù)等于除以這兩個(gè)數(shù)的積來(lái)簡(jiǎn)算;
0.125×32×8運(yùn)用乘法交換律簡(jiǎn)算;1.7×0.25×4運(yùn)用乘法結(jié)合律簡(jiǎn)算;其它題目按照運(yùn)算法則直接求解.
點(diǎn)評(píng):本題是基本的計(jì)算題目,計(jì)算時(shí)要細(xì)心,注意小數(shù)點(diǎn)的位置.
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9.5×100=1.25×80.25×0.9×4=1.87×0=
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口算
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