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题目简介
若则.-九年级数学
题目详情
答案
所以 a=2 b=3 c="4"
所以 a-b+c=2-3+4=3
点评:本题考查了绝对值非负数,算术平方根非负数的性质,二次方的非负性,根据几个非负数的和等于0,则每一个算式都等于0列式是解题的关键.