0.15+0.5=0.2÷0.1=1.8×6=1-0.23=
2.5×4=6÷5=20×0.5=0.39÷3=
1.05×5=2.16+3.84=4.8÷1.6=10-4.3=

解:
0.15+0.5=0.65,0.2÷0.1=2,1.8×6=10.8,1-0.23=0.77,
2.5×4=10,6÷5=1.2,20×0.5=10,0.39÷3=0.13,
1.05×5=5.25,2.16+3.84=6,4.8÷1.6=3,10-4.3=5.7.
故答案為:0.65,2,10.8,0.77,10,1.2,10,0.13,5.25,6,3,5.7.
分析:0.15+0.5注意0.5是一位小數(shù),不要算成0.2;0.2÷0.1先把0.1根據(jù)商不變規(guī)律化成1再計算;1.05×5注意因數(shù)中間有0的乘法;其它題目根據(jù)運算法則直接求解.
點評:本題考查了基本的計算,計算時要細心,注意小數(shù)點的位置.
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