Тут все на листке, очень

1.
$1) \frac{1}{6} \times 12 + \frac{1}{3} \times \frac{9}{10} = \\ 2 + \frac{3}{10} = 2 + 0.3 = 2.3$
$2)2.1 + 1 \frac{3}{10} \times \frac{9}{13} = 3\\ \frac{13}{10} \times \frac{9}{13} = \frac{9}{10} = 0.9 + 2.1 = 3$
2.
$1)15 \times 0.2 = 3 \\ 2) \sqrt{4 \times 7} \times \sqrt{9 \times 7} = \\ 2 \sqrt{7} \times 3 \sqrt{7} = 2 \times 3 \times 7 = 42$
$3) \frac{ \sqrt{48} }{ \sqrt{3} } = \sqrt{16} = 4$
$4) \sqrt{1.69 - 1.44} = \sqrt{0.25 } =0.5$
$3)1) {a}^{2} = 100 - 75 = 25 \\ a = 5 \\$
$2) {d}^{2} = 3 \div \frac{1}{8} = 3 \times \frac{8}{1} = 24 \\ = \sqrt{6 \times 4} = 2 \sqrt{6}$

Тут все ** листке, очень