求这两题的简便运算0.75×9÷0.15 20.7÷0.23÷4.5= == =

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求这两题的简便运算0.75×9÷0.15 20.7÷0.23÷4.5= == =
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求这两题的简便运算0.75×9÷0.15 20.7÷0.23÷4.5= == =
求这两题的简便运算
0.75×9÷0.15 20.7÷0.23÷4.5
= =
= =

求这两题的简便运算0.75×9÷0.15 20.7÷0.23÷4.5= == =
0.75×9÷0.15=0.75÷0.15×9=5×9=45 交换律
20.7÷0.23÷4.5=(20.7÷0.23)÷4.5=9÷4.5=2