x1➖x2的绝对值是什么 理工学科->数学
\u6570\u5b66 \u7406\u5de5\u5b66\u79d1 \u5b66\u4e60\u7528\u9006\u63a8\u6cd5\uff0c\u5148\u53bb\u5206\u6bcd\uff0c\u4e24\u8fb9\u540c\u4e584\uff081+x\uff09(1+y)(1+z),\u53c8\u56e0\u4e3ax+y+z=1\u5f974+12xzy+8zy+8xz+8xy<=6+3zy+3xy+3zx+6zxy
6zxy+5zy+5xz+5xy<=2
\u53c8\u56e0\u4e3ax,y,z\u662f\u6b63\u6570\uff0cx+y+z=1\u53ef\u77e5x,y,z\u90fd\u662f\u5c0f\u4e8e1\u5927\u4e8e0\u7684\u6570
\u6545xzy,zy,xz,xy\u90fd\u662f\u662f\u767e\u5206\u4f4d\uff0c\u5341\u5206\u4f4d\u7684\u5c0f\u6570,\u7531\u6b64\u53ef\u77e5
1<6zxy+5zy+5xz+5xy<=2
\u6ee1\u8db3\u6761\u4ef6\uff0c\u5373\u6210\u7acb\u3002
\u8fd8\u6709\u5176\u5b83\u7684\u65b9\u6cd5\uff0c\u4f60\u4e5f\u53ef\u4ee5\u8bd5\u7740\u53bb\u63a8\u6572\u3002
\u4ece\u5c0f\u660e\u5bb6\u5230\u5b66\u6821\u7684\u8def\u7a0b\u662f2400\u7c73\uff0c\u5982\u679c\u5c0f\u660e\u65e9\u4e0a7\u70b9\u79bb\u5bb6\uff0c\u8981\u57287\u70b930\u5206\u523040\u5206\u4e4b\u95f4\u5230\u8fbe\u5b66\u6821\uff0c\u8bbe\u6b65\u884c\u901f\u5ea6\u4e3aX \u7c73/\u5206\uff0c\u5219\u53ef\u5217\u4e0d\u7b49\u5f0f\u7ec4\u4e3a__30x=2400________________\uff0c\u5c0f\u660e\u6b65\u884c\u7684\u901f\u5ea6\u8303\u56f4\u662f____60<=x<=80_____\u3002
x1➖x2的绝对值是什么=√(x1-x2)²
=√[(x1+x2)²-4x1x2]
=√(b²-4ac) /|a|
是数轴上两点间的距离
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