3.5×9.9+3.5的简便运算

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3.5×9.9+3.5的简便运算3.5×9.9+3.5的简便运算3.5×9.9+3.5的简便运算3.5×9.9+3.5=3.5*(10-0.1)+3.5=3.5*10-3.5*0.1+3.5=35+3

3.5×9.9+3.5的简便运算
3.5×9.9+3.5的简便运算

3.5×9.9+3.5的简便运算
3.5×9.9+3.5
=3.5*(10-0.1)+3.5
=3.5*10-3.5*0.1+3.5
=35+3.5-0.35
=38.5-0.35
=38.15