[(2又3/5)^0]+[2^(-2)]*[(2又1/4)^-1/2]-[(0.01)^0.5]=1+1/4*(9/4)^-1/2-0.1=1+1/4*2/3-0.1=1+1/6-0.1=11/15
=1+0.25*(2/3)+0.1=1.1+1/6=19/15 ∵一元二次方程有两个不同的实数根∴(2a-8) 2;-4*1*(a 2;+1)>b^2-4ac>0 4(a-4)^