x2+4ax-4a+3=0,Δ=4(2a-1)(2a+3)≥0,a≥1/2或a≤-3/2; x2+(a-1)x+a2=0,Δ=(-3a+1)(a+1)≥0,
-1≤a≤1/3;x2+2ax-2a=0,Δ=4a(a+2)≥0,a≥0或a≤-2;把结果在数轴标出来,只有-3/2到-1之间没有交叉,则实数a的取值范围a≥-1或a≤-3/2.
x2+4ax-4a+3=0,Δ=4(2a-1)(2a+3)≥0,a≥1/2或a≤-3/2; x2+(a-1)x+a2=0,Δ=(-3a+1)(a+1)≥0,
-1≤a≤1/3;x2+2ax-2a=0,Δ=4a(a+2)≥0,a≥0或a≤-2;把结果在数轴标出来,只有-3/2到-1之间没有交叉,则实数a的取值范围a≥-1或a≤-3/2.