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146+38=126-70=2.3+4.68=5.23-2.2=
9÷1.5=2.25×4=30×20%=6.4÷0.8=
数学公式-数学公式=数学公式+数学公式=数学公式×数学公式=数学公式÷数学公式=
3-数学公式-数学公式=数学公式+数学公式)×3=数学公式×数学公式×数学公式=数学公式×6+6×数学公式=

解:
146+38=184,126-70=56,2.3+4.68=6.98,5.23-2.2=3.03,
9÷1.5=6,2.25×4=9,30×20%=6,6.4÷0.8=8,
-=+=×=÷=
3--=2,+)×3=2××=×6+6×=6.

分析:根据整数、小数、分数和百分数的加减乘除的计算方法进行计算即可;3--=3-(+);(+)×3和×6+6×根据乘法分配律进行简算.
点评:口算时,注意运算符号和数据,然后再进一步计算即可;能简算的要简算.
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146+38= 126-70= 2.3+4.68= 5.23-2.2=
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3
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4
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3
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7
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3
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