问题标题:
这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^2
问题描述:

这条算式的答案是甚么?

(a-4)^2+[3/4(a-4)]^2

何丽明回答:
  (a-4)^2+[3/4(a-4)]^2=25/16(a-4)^2=(5a/4-5)^2
杜永文回答:
  为甚么是25/16而不是9/16?
何丽明回答:
  (a-4)^2+[3/4(a-4)]^2=(1+9/16)(a-4)^2=25/16(a-4)^2=(5a/4-5)^2
杜永文回答:
  3/4为甚么变了1+9/16?1从何而来?对不起我数学很差,谢谢你!
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