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11abcdbab54222326yxx2232abba223123abcabcba4233)2()21(nmnm81,4yx52241)(1471xxyxy.2223232aaaxyxyxyyxmn22312)32()5(-22nmnnmxyzzxyzyx)(2322(a+4)(a+3)))((bxax)3)(52(yxyx)42)(2(2aaa)23)(3(2)3)(2(babaaa226xmxxxnmn_cbxaxxx2)25)(32(cba=abcd331.2(5+3p)2x+2y2(2a5)222221221yxyx2.abbaab44)3)(3(yxyx)511)(511(yy)14)(14(aa(7+6x)(7-6x)(3yx)(x-3y)(-m2n)(-m-2n)16a3b9a2b2c6a3b9a2b2c+3a2b8a2b2+4a2b2ababybax23126mnnmyxyyx5422.5522)()(yxyx2)(9ba2)(4ba25(a+b)2+4(ab)2x2y2=1x+y=21xy3.1x2x222b9ab12a422y9xy30x25xy4y4x2216mxx2m0b16ab8a225.2ba=66