9.21 1)a(a+20(2a+1) 2)a(a+6)(a-7) 3)-a(3a-2)(2a-3) 4)-a(3a-2)2
9.22 1)x(x+1)(2x-7) 2)-x(x+1)(2x-7) 3)0,25x(8x2-8x+1) 4)-X(2X-1)(3X-2)
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9.21 1)a(a+20(2a+1) 2)a(a+6)(a-7) 3)-a(3a-2)(2a-3) 4)-a(3a-2)2
9.22 1)x(x+1)(2x-7) 2)-x(x+1)(2x-7) 3)0,25x(8x2-8x+1) 4)-X(2X-1)(3X-2)