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2.5÷0.5=3.5÷0.01=0.2×50=0.2+0.78=8×2.5=1.5×4=
0.12×3=0.1-0.02=72.5÷0.8=42÷0.6=3×0.2×0.5=3.9÷5÷0.2=

解:2.5÷0.5=53.5÷0.01=3500.2×50=100.2+0.78=0.988×2.5=201.5×4=6
0.12×3=0.360.1-0.02=0.0872.5÷0.8=90.62542÷0.6=703×0.2×0.5=0.33.9÷5÷0.2=3.9

分析:根据小数除法、乘法、加法、减法的运算法则计算即可,3×0.2×0.5利用乘法结合律计算,3.9÷5÷0.2利用除法的性质计算.
点评:在完成小数乘除法时,要注意小数点位置的变化,完成小数加减法时,要注意小数点的对齐.
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(3)
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9
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1
9
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7
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7
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