1.(4x^+1)(2x+1)(2x-1)\r\n2.a^2(a+1)（a-1)\r\n3.(24x-39y)(39y-2x)\r\n4.(x-Y)*4xy\r\n5.(5x-3)^2\r\n6.5(2ab-1)^2\r\n7.-y(7x-1)^2
