已知根号下16+x² -根号下x²+4 =2 求根号下16+x² +根号下x²+4的值-.-
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![已知根号下16+x² -根号下x²+4 =2 求根号下16+x² +根号下x²+4的值-.-](/uploads/image/z/1790933-5-3.jpg?t=%E5%B7%B2%E7%9F%A5%E6%A0%B9%E5%8F%B7%E4%B8%8B16%2Bx%26%23178%3B+-%E6%A0%B9%E5%8F%B7%E4%B8%8Bx%26%23178%3B%2B4+%3D2+%E6%B1%82%E6%A0%B9%E5%8F%B7%E4%B8%8B16%2Bx%26%23178%3B+%2B%E6%A0%B9%E5%8F%B7%E4%B8%8Bx%26%23178%3B%2B4%E7%9A%84%E5%80%BC-.-)
已知根号下16+x² -根号下x²+4 =2 求根号下16+x² +根号下x²+4的值-.-
已知根号下16+x² -根号下x²+4 =2 求根号下16+x² +根号下x²+4的值
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已知根号下16+x² -根号下x²+4 =2 求根号下16+x² +根号下x²+4的值-.-
由√16+x²-√x²+4=2,得√16+x²=(-√x²+4)+2,两边同时平方得16+x²=4+(4√x²+4)+x²+4,
解得√x²+4=2,x=0,将X代入就可以求得原式=√16+√4=6.