1.(-1)的2012次方+(π-3.14)的0次方+(1/3)的-2次方=1+1+9=112.(3b²)/(16a)÷(bc)/(2a² ) *(-2a/b)
=[3b²*2a²*(-1a)]/(16a*bc*b)
=[3*a²*(-1)]/(8*c)
=-3a²/(8c)
3.(x+3)/(x²-9)+ 3/x-3
=(x+3)/[(x+3)(x-3)]+ 3/(x-3)
=4/(x-3)
4.(x²/x+2 - 4/x+2)÷ x-2/x
=(x-2)*[x/(x-2)]
=x
5.x-1/x-2 + 1/2-x=3
(x-2)/(x-2)=3
6.x/2x-4 - 1/4-x²=1/2
x/2(x-2)+1/(x-2)(2+x)=1/2
2x+x²+2=1/2
2x²+4x+4=2x²-8
4x=-12
x=-3