Question

先化简,在求值:4x(x+1)-(2x+1)(2x-1),其中x=-2分之1

Answer 1

原式=4x²+4x-4x²+1

=4x+1

=4*(-1/2)+1

=-2+1

=-1

2^12-1

=(2^6+1)(2^6-1)

=65×63

所以是65和63