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时间:2015-08-25 09:46
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1.3.7654平方+0.4+0.2346平方2.已知a-1/a=4 (1).求a的平方 + 1/a的平方 (2) (a-2)(1/a + 2)3.已知x+y-z=a xy-xz-yz=b 求 x平方+y平方+z平方_百度作业帮
1.3.7654平方+0.4+0.2346平方2.已知a-1/a=4 (1).求a的平方 + 1/a的平方 (2) (a-2)(1/a + 2)3.已知x+y-z=a xy-xz-yz=b 求 x平方+y平方+z平方
1.3.7654平方+0.4+0.2346平方2.已知a-1/a=4 (1).求a的平方 + 1/a的平方 (2) (a-2)(1/a + 2)3.已知x+y-z=a xy-xz-yz=b 求 x平方+y平方+z平方
1.原式=(3.6)^2=162.1) a^2+1/a^2-2=16,a^2+1/a^2=182) 原式=1+2a-2/a-4=-3+2(a-1/a)=-3+8=53.x^2+y^2+z^2+2xy-2xz-2yz=a^22xy-2xz-2yz=2bx^2+y^2+z^2=a^2-2bError - Cannot Connect to Server
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