题库搜索>问题求解PS-13494
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分析B选项
分析C选项
分析D选项
分析E选项
2/(8-3根号7) 先分子分母同乘以8-3根号7 = 2(8-3根号7)
2根号63= 2根号下 7*9 = 6根号7
6根号7-6根号7 +16=16
根号下16=4
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