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2-1.1=1-数学公式=3.5÷5=0.28÷0.7=4.5×3=1.3×0.4=
数学公式-数学公式=数学公式+数学公式=12×数学公式=数学公式÷数学公式=1-70%=42=

解:
2-1.1=0.9,1-=3.5÷5=0.7,0.28÷0.7=0.4,4.5×3=13.5,1.3×0.4=0.52,
-=+=1,12×=8,÷=1-70%=30%,42=16.

分析:本题根据小数、分数的加法、减法、乘法、除法的运算法则计算即可.
点评:完成本题要细心分析式中数据,然后快速准确得出答案.
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