回答:
#=>色(藍)((6x ^ 2)/((4x + 1)(x-1)(7x + 1)(x + 1))#
説明:
#((6x)/(4x ^ 2 -3x -1))*(6 /(7x ^ 2 + 8x + 1))#
#=>(6x * x)/((4x ^ 2-3x-1)*(7x ^ 2 + 8x + 1))#
#=>(6x ^ 2)/((4x ^ 2 -4x + x - 1)*(7x ^ 2 + 7x + x + 1))#
#=>(6x ^ 2)/((4x(x-1)+(x - 1))*(7x(x + 1)+(x + 1))#
#=>(6x ^ 2)/((4x + 1)(x-1)(7x + 1)(x + 1))#