Ответ:

решение смотри на фотографии

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[tex]a) \: \: \: \: \: \sqrt{2.56} + 2 \sqrt{1.69} = 1.6 + 2 \times 1.3 = 1.6 + 2.6 = 4.2[/tex]

[tex]б) \: \: \: \: \: \sqrt{3600} - \sqrt{6400} = 60 - 80 = - 20[/tex]

[tex]в) \: \: \: \: \: \sqrt{49 \times 25 \times 100} = 7 \times 5 \times 10 = 350[/tex]

[tex]г) \: \: \: \: \: \sqrt{50} \times \sqrt{2} = \sqrt{25 \times 2} \times \sqrt{2} = 5 \sqrt{2} \times \sqrt{2} = 5 \times 2 = 10[/tex]

[tex]д) \: \: \: \: \: \sqrt{32} \times \sqrt{2} = \sqrt{16 \times 2} \times \sqrt{2} = 4 \sqrt{2} \times \sqrt{2} = 4 \times 2 = 8[/tex]

[tex]е) \: \: \: \: \: \sqrt{( - 139)^{2} } = - 139[/tex]

[tex]ж) \: \: \: \: \: \sqrt{0.64 \times 12100} = 0.8 \times 110 = 88[/tex]

[tex]з) \: \: \: \: \: \sqrt{7^{4} } = {7}^{2} = 49[/tex]

[tex]и) \: \: \: \: \: \sqrt{ {2}^{6} \times {3}^{4} \times {0.1}^{4} } = {2}^{3} \times {3}^{2} \times {0.1}^{2} = 8 \times 9 \times 0.01 = 0.72[/tex]

[tex]к) \: \: \: \: \: (5 \sqrt{10} )^{2} - (10 \sqrt{5} ) ^{2} = 25 \times 10 - 100 \times 5 = 250 - 500 = - 250[/tex]