admin百科知識 2022-02-13 22:57:40 已知多項式2x2+3xy-2y2-x+8y-6的值恒等於2x2+3xy-2y2+A(2x-y)+B(x+2y)+AB.求A+B的值.已知多項式2x23xy-2y2-x 8y-6的值恒等於2x23xy-2y2 A(2x-y) B(x 2y) AB.求A B的值.網友廻答:匿名網友2x23xy-2y2-x 8y-6=2x23xy-2y2 A(2x-y) B(x 2y) AB=2x23xy-2y2 (2A B)x (-A 2B)y AB,∴2A B=-1,-A 2B=8,AB=-6,解得:A=-2,B=3,則A B=-2 3=1. db標簽 生活常識_百科知識_各類知識大全»已知多項式2x2+3xy-2y2-x+8y-6的值恒等於2x2+3xy-2y2+A(2x-y)+B(x+2y)+AB.求A+B的值.
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