Срочно даю 90баллов 31.1 1)(х+у)(x-y) 3)(k-2)(k+2) 5)(4+b)(4-b) 31.3разложите на множители 1)(а^2-49 ;3)с^2-2,25 5)64/81-х^2 7)z^2-169/196 9)25х^2-36 11)0,64-1/9z^2
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31.1
1)х²-у²
3)к²-4
5)16-b²
31.3
1)(а-7)(а+7)
3)(с+1,125)(с-1,125)
5)(8/9-х)(8/9+х)
7)(z-13/14)(z+13/14)
9)(5х-6)(5х+6)
11)(0,8-1/3z)(0,8+z)