4) \((-0,4)^2-(-0,3)^2\); 5) \((4^4:800+0,4^2):(-0,2)^2\); 6) \((5,9-6,1)^3\cdot\left(-1\frac{1}{2}\right)^2\).

\[(-0.4)^2-(-0.3)^2=0.16-0.09=0.07.\]

Ответ: \(0,07\).

\[(4^4:800+0.4^2):(-0.2)^2=(256:800+0.16):0.04=(0.32+0.16):0.04=0.48:0.04=12.\]

Ответ: \(12\).

\[(5.9-6.1)^3\cdot\left(-1\frac{1}{2}\right)^2=(-0.2)^3\\cdot\left(-\frac{3}{2}\right)^2=-0.008\cdot\frac{9}{4}=-0.018.\]

Ответ: \(-0,018\).