计算:√4÷(1、2)ˆ-1+(-1)ˆ2013×4ˆ0
=2 ÷ 2 + (-1) * 1
= 1 -1 =0
x²+3x-1=0
b²-4ac=13
x= -(3+√13)/2或(√13-3)/2
(x-2)²+∣y-3∣=...