解:(1)由题,b=3,a≠-2 (2)由题,a=-2,b≠3
$ 解:(1)A_{1}(8,4),A_{2}(4,-8)$ $(2)B_{1}(a+m,b),B_{2}(b,-a-m)$ $(3)P_{2}(d,-c-n)或(d,-c+n)$
$解:过D作DE⊥x轴于E$ $易知∠DAB=45°$ $∴△DAE为等腰直角三角形$ $∴容易求得DE=OE=2\sqrt {2}$ $∴A(0,0),B(6,0),C(2\sqrt {2}+6,2\sqrt {2}),D(2\sqrt {2},2\sqrt {2})$ $解:第一种情况,过D作DE⊥x轴于E$ $∵∠C=45°,∴△DEC为等腰直角三角形$ $∴DE=EC=OC-OE=2$ $∴A(0,2),B(0,0),C(5,0),D(3,2)$ $第二种情况$ $A(0,0),B(0,-2),C(5,-2),D(3,0)$
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