1) п?риведите дробь ax/3b^2 к знаминателю 12ab^2 2) вычесление 11x-y/8x - 2x+5y/8x ...

Решите задачу:

$1) \: \frac{ax}{3b ^{2} } \times 4a= \frac{4 {a}^{2} x}{12a {b}^{2} } \\ 2) \: \frac{11x - y}{8x} - \frac{2x + 5y}{8x} = \frac{11x - y - 2x - 5y}{8x} = \frac{9x - 6y}{8x} = \frac{3(3x - 2y)}{8x} \\ 3) \: \frac{4b ^{3} }{b - 2} \times \frac{4 - 4b + {b}^{2} }{8 {b}^{2} } = \frac{b \times (b - 2) ^{2} }{(b - 2) \times 2} = \frac{b \times (b - 2)}{2} = \frac{{b}^{2} 2b}{2} = {b}^{3}$
$4) \: (\frac{2 {a}^{2} b}{3 {c}^{3} } ) ^{4} = \frac{ {2}^{4} {a}^{2 \times 4} {b}^{4} }{ {3}^{4} {c}^{3 \times 4} } = \frac{16 {a}^{8} {b}^{4} }{81 {c}^{12} }$
$5) \: \frac{b}{b - a} - \frac{ {a}^{2} - {b}^{2} }{ab + {b}^{2} } \div \frac{(b - a) ^{2} }{ {b}^{3} } = \frac{b}{b - a} + \frac{(b - a)(b + a) \times {b}^{3} }{b(a + b)(b - a) ^{2} } = \frac{b}{b - a} + \frac{ {b}^{2} }{b - a} = \frac{b + {b}^{2} }{b - a} = \frac{b(1 + b)}{b - a}$