36-(-(9c-15))=3(3c+7)
36+9c-15=9c+21
9c-9c=21-36+15
0=0
<span>A)300градусов IV
b)900градусов (900-720 =180) на границе II-III
c)-650градусов (720-650=70) I
d)3пи/4 45*3 =135 II
e) -2пи\5 -2/5 пи неполный пи III</span>
![\sqrt{x}+2\sqrt{y}=5\\\sqrt{x}=5-2\sqrt{y}\\x=25-20\sqrt{y}+4y\\\\2^{25-20\sqrt{y}+4y}*2^{2y}=2^9\\25-20\sqrt{y}+6y=9\\\\\sqrt{y}=t\\6t^2-20t+16=0\\t_1=\frac{4}{3};t_2=2\\y_1=\frac{16}{9};y_2=4\\x_1=25-\frac{80}{3}+\frac{64}{9}=\frac{49}{9};x_2=25-40+16=1](https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%2B2%5Csqrt%7By%7D%3D5%5C%5C%5Csqrt%7Bx%7D%3D5-2%5Csqrt%7By%7D%5C%5Cx%3D25-20%5Csqrt%7By%7D%2B4y%5C%5C%5C%5C2%5E%7B25-20%5Csqrt%7By%7D%2B4y%7D%2A2%5E%7B2y%7D%3D2%5E9%5C%5C25-20%5Csqrt%7By%7D%2B6y%3D9%5C%5C%5C%5C%5Csqrt%7By%7D%3Dt%5C%5C6t%5E2-20t%2B16%3D0%5C%5Ct_1%3D%5Cfrac%7B4%7D%7B3%7D%3Bt_2%3D2%5C%5Cy_1%3D%5Cfrac%7B16%7D%7B9%7D%3By_2%3D4%5C%5Cx_1%3D25-%5Cfrac%7B80%7D%7B3%7D%2B%5Cfrac%7B64%7D%7B9%7D%3D%5Cfrac%7B49%7D%7B9%7D%3Bx_2%3D25-40%2B16%3D1)
Ответ: (49/9; 16/9); (1; 4).
Область определения [-3;1] U (2; 4]