2-1.1=1-數(shù)學(xué)公式=3.5÷5=0.28÷0.7=4.5×3=1.3×0.4=
數(shù)學(xué)公式-數(shù)學(xué)公式=數(shù)學(xué)公式+數(shù)學(xué)公式=12×數(shù)學(xué)公式=數(shù)學(xué)公式÷數(shù)學(xué)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:本題根據(jù)小數(shù)、分數(shù)的加法、減法、乘法、除法的運算法則計算即可.
點評:完成本題要細心分析式中數(shù)據(jù),然后快速準確得出答案.
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