分析:①根據(jù)小數(shù)四則混合運(yùn)算的運(yùn)算順序,先算乘法,然后根據(jù)同一級(jí)運(yùn)算,按從左往右依次進(jìn)行計(jì)算即可;
②把32分成8×4,然后運(yùn)用乘法結(jié)合律進(jìn)行簡(jiǎn)算即可;
③先算小括號(hào)的,再算除法,最后算加法;
④先算小括號(hào)的,再算中括號(hào)的,最后算除法;據(jù)此進(jìn)行解答即可.
解答:解:①16.75-1.5×3-4.55
=16.75-4.5-4.55
=12.25-4.55
=7.7;
②12.5×32×2.5
=12.5×(8×4)×2.5
=(12.5×8)×(4×2.5)
=100×10
=1000;
③6.45+3.55÷(30-29.5)
=6.45+3.55÷0.5
=6.45+7.1
=13.55;
④0.36×[5.4÷(0.6+1.2)]
=0.36×[5.4÷1.8]
=0.36×3
=1.08.
點(diǎn)評(píng):此題考查了小數(shù)四則混合運(yùn)算,應(yīng)明確小數(shù)四則混合運(yùn)算的運(yùn)算順序和整數(shù)四則混合運(yùn)算的運(yùn)算順序相同;注意能簡(jiǎn)算的要簡(jiǎn)算.