Question

计算题 （-1）²+（-1/2）的-1次方-5÷（3.14-π）的0次方=

Answer 1

（-1）²+（-1/2）的-1次方-5÷（3.14-π）的0次方

=1-2-5÷1

=1-2-5

=-6

x²-（x+2)(x-2)-(x+1/x)²

=x²-(x²-4)-(x²+2+1/x²)

x²-x²+4-x²-2-1/x²

=-(x²-2+1/x²)

=-(x+1/x)²

[(x+y)²-(x-y)²]÷（2xy)

=(x²+2xy+y²-x²+2xy-y²)÷（2xy)

=4xy÷（2xy)

=2