Làm nhanh giúp mình với ạ

$a)\sqrt{0,36a^2}=\sqrt{(0,6a)^2}=|0,6a|=-0,6a(a<0)$

$b)\sqrt{27.48.(1-a)^2}=\sqrt{3^3.2^4.3.(1-a)^2}=\sqrt{9^2.4^2.(1-a)^2}=9.2.|1-a|=18.(a-1)=18a-18(a>1)$

$c)\sqrt{\dfrac{2a}{3}}.\sqrt{\dfrac{3a}{8}}\sqrt{\dfrac{2a.3a}{3.8}}=\sqrt{\dfrac{a^2}{4}}=\dfrac{a}{2}(a≥0)$

$d)(3-a)^2-\sqrt{0,2}.\sqrt{180a^2}=(3-a)^2.\sqrt{0,2.180a^2}=(3-a)^2-\sqrt{36a^2}=(3-a)^2-6|a|$

$+)a>0$

$(3-a)^2-\sqrt{0,2}.\sqrt{180a^2}=(3-a)^2.\sqrt{0,2.180a^2}=(3-a)^2-\sqrt{36a^2}=(3-a)^2-6a=9-6a+a^2-6a=a^2-12a+9$

$+)a<0$

$(3-a)^2-\sqrt{0,2}.\sqrt{180a^2}=(3-a)^2.\sqrt{0,2.180a^2}=(3-a)^2-\sqrt{36a^2}=(3-a)^2-6a=9-6a+a^2-6(-a)=a^2+9$