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Решите задачу:

$447\\ a)3\sqrt{0.0009}+9\sqrt{\frac1{10000}}=3*0.03+9*\frac1{100}=0.09+0.09=0.18\\ b) \sqrt{2\frac79}:( \sqrt{\frac4{81}}+( \sqrt{\frac49} )^2)=\sqrt{\frac{25}9}:( \sqrt{\frac4{81}}+\frac49} )=\frac{5}3:( \frac29}+\frac49} )=\\=\frac{5}3: \frac69=\frac{5}3* \frac96=\frac{15}6=2.5\\ v) \sqrt{0.0144} +2 \sqrt{0.0225} * \sqrt{ \frac{4}{9} } =0.12+2*0.15*\frac23=\\=0.12+0.2=0.32\\$

$g) \frac59( \sqrt{40000}- \sqrt{22500}):( \sqrt{1} - \sqrt{\frac{16}{81}} )=\\= \frac59( 200-150):( 1 - \frac49} )=\frac59*50:\frac59} =50$

$459\\ a)x^2=144\\ x_1=12\\ x_2=-12\\ \\ b)x^2=15\\ x_1= \sqrt{15} \\ x_2=-\sqrt{15}\\ \\ v)x^2=1.21\\ x_1= 1.1 \\ x_2=-1.1\\ \\ g)x^2=\frac25\\ x_1= \sqrt{\frac25} \\ x_2=-\sqrt{\frac25}\\ \\ d)5x^2=20\\ x^2=4\\ x_1=2 \\ x_2=-2\\ \\ e)2-x^2=4\\ -x^2=2\\ x^2=-2\\ x - nety \ reshenij\\ \\ e)4x^2+5=41\\ 4x^2=36\\ x^2=9\\ x_1=3 \\ x_2=-3\\ \\ j)3(x^2+4)=9\\ x^2+4=3\\ x^2=-1\\ x - nety \ reshenij\\$