Question

Даю 25 балов, помогите!

Answer 1

1 1 - 11

2 - 3.1

3 - 44

4 - $\sqrt{27*3} = \sqrt{81} = 9$

5 - $\sqrt{\frac{343}{7} } = \sqrt{49} = 7$

2 1

$\sqrt{x} =14\\x = 14^{2} \\x = 196\\\sqrt{196} = 14\\ 14 = 14$

2 $\sqrt{x} = -3$

корней нет

3

$\sqrt{x} -5=0\\\sqrt{x} =5\\x =5^{2} \\x = 25\\\sqrt{25} -5 =0\\0=0$

3 1

$0.2\sqrt{400}-\frac{1}{3} \sqrt{81}= 0.2*20-\frac{1}{3} *9 = 4-3 = 1$

2

$(2\sqrt{7 )^{2}} - (7\sqrt{2 )^{2}}= 4*7-49*2=28-98=-70$