Question

разложите на множители:1)а^2-49 2)64-b^2 3)c^2-2,25 4)2,89-d^2 5)64/81-x^2 6)100/121-y^2 7)z^2-169/196 8)t^2-400/441 9)25x^2-36 10)-16+49y^2 11)0,64-1/9z^2 12)4/25t^2-36

Answer 1

$1)(a - 7)(a + 7) \\ 2)(8 - b)(8 + b) \\ 3)(c - 1.5)(c + 1.5) \\4) (1.7 - d)(1.7 + d) \\ 5) (\frac{8}{9} - x)( \frac{8}{9} + x) \\ 6)( \frac{10}{11} - y)( \frac{10}{11} + y) \\ 7)( z - \frac{13}{14} )(z + \frac{13}{14} ) \\ 8)(t - \frac{20}{21} )(t + \frac{20}{21} ) \\ 9)(5x - 6)(5x + 6) \\ 10)(7y - 4)(7y + 4) \\ 11)(0.8 - \frac{1}{3} z)(0.8 + \frac{1}{3} z) \\ 12) \frac{2}{5}t - 6)( \frac{2}{5} t + 6)$