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在一幅长60cm,宽40cm的矩形风景画的四周镶一条金色纸边,制成一幅矩形挂图,如图所示,如果要使整个挂图的面积是ycm2,设金色纸边的宽度为xcm2,那么y关于x的函数是( ) A.y=(60+2x)(40+2x)B.y=(60+x)(40+x) C.y=(60+2x)(40+x)D.y=(60+x)(40+2x) ...