能用简便方法计算的要用简便方法计算． 457÷25÷4 （35-14）×47 57×16+27÷6 7.1+0.9×
能用简便方法计算的要用简便方法计算．457÷25÷4（35-14）×4757×16+27÷67.1+0.9×（0.9-0.75）920÷[12×（25+45）]．...
能用简便方法计算的要用简便方法计算． 457÷25÷4 （35-14）×47 57×16+27÷6 7.1+0.9×（0.9-0.75） 920÷[12×（25+45）]．
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①457÷25÷4
=457÷（25×4）
=457÷100
=4.57
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④7.1+0.9×（0.9-0.75）
=7.1+0.9×0.15
=7.1+0.135
=7.235
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=457÷（25×4）
=457÷100
=4.57
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④7.1+0.9×（0.9-0.75）
=7.1+0.9×0.15
=7.1+0.135
=7.235
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