7. Найдите значение выражения: а) 37 +с при с = 12; -1; 27; -28; 63; 18 6) Va-ь при а=70, b=6; a=38, b=-43; a=,b=-1; a=0,93, b=0,57; a=-0,29, b=-0,78; в) 2х-х при х=0; 0,01; 900.

7. Найдите значение выражения:

1. a) \\ $$ \sqrt{37 + c} $$
   1. $$ c = 12; \sqrt{37 + 12} = \sqrt{49} = 7 $$
   2. $$ c = -1; \sqrt{37 - 1} = \sqrt{36} = 6 $$
   3. $$ c = 27; \sqrt{37 + 27} = \sqrt{64} = 8 $$
   4. $$ c = -28; \sqrt{37 - 28} = \sqrt{9} = 3 $$
   5. $$ c = 63; \sqrt{37 + 63} = \sqrt{100} = 10 $$
2. б) \\ $$ \sqrt{a - b} $$
   1. $$ a = 70, b = 6; \sqrt{70 - 6} = \sqrt{64} = 8 $$
   2. $$ a = 38, b = -43; \sqrt{38 - (-43)} = \sqrt{38 + 43} = \sqrt{81} = 9 $$
   3. $$ a = \frac{3}{4}, b = -\frac{1}{18}; \sqrt{\frac{3}{4} - (-\frac{1}{18})} = \sqrt{\frac{3}{4} + \frac{1}{18}} = \sqrt{\frac{27}{36} + \frac{2}{36}} = \sqrt{\frac{29}{36}} = \frac{\sqrt{29}}{6} $$
   4. $$ a = 0.93, b = 0.57; \sqrt{0.93 - 0.57} = \sqrt{0.36} = 0.6 $$
   5. $$ a = -0.29, b = -0.78; \sqrt{-0.29 - (-0.78)} = \sqrt{-0.29 + 0.78} = \sqrt{0.49} = 0.7 $$
3. в) \\ $$ 2\sqrt{x} - x $$
   1. $$ x = 0; 2\sqrt{0} - 0 = 0 $$
   2. $$ x = 0.01; 2\sqrt{0.01} - 0.01 = 2 \cdot 0.1 - 0.01 = 0.2 - 0.01 = 0.19 $$
   3. $$ x = 900; 2\sqrt{900} - 900 = 2 \cdot 30 - 900 = 60 - 900 = -840 $$

Ответ:a) 7, 6, 8, 3, 10; б) 8, 9, $$\frac{\sqrt{29}}{6}$$, 0.6, 0.7; в) 0, 0.19, -840