Question

计算(1-x+ x分之x-1)除以(1- x+1分之1)

Answer 1

原式=(x-x²+x-1)/x÷(x+1-1)/(x+1)

=-(x-1)²/x*(x+1)/x

=-(x-1)²(x+1)

=-(x-1)(x²+1)

=-x³+x²-x+1