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四到六年级：整数巧算，（75+76+77）÷（74+75+76+77+78）＝？
四到六年级“整数巧算”：（75+76+77）÷（74+75+76+77+78）＝？
五～六年级简便计算85/95
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四到六年级“整数巧算”：（75+76+77）÷（74+75+76+77+78）＝？
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