6.4÷0.8=7.5-4.5=5.7+4.3=0.52=
1÷0.25=48.5÷4.85=0.36×2=2.5×4÷2.5×4=

解:(1)6.4÷0.8=8(2)7.5-4.5=3(3)5.7+4.3=10(4)0.52=0.25
(5)1÷0.25=4(6)48.5÷4.85=10(7)0.36×2=0.72(8)2.5×4÷2.5×4=16

分析:(1)(5)(6)根據(jù)小數(shù)除法的計(jì)算方法計(jì)算,
(2)(3)根據(jù)小數(shù)加減法的計(jì)算方法計(jì)算,
(4)根據(jù)平方的意義計(jì)算,
(7)根據(jù)小數(shù)乘法的計(jì)算方法計(jì)算,
(8)先把除法化成乘法,再根據(jù)乘法結(jié)合律計(jì)算.
點(diǎn)評(píng):本題主要考查了學(xué)生小數(shù)四則運(yùn)算的計(jì)算的能力.
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