\(1,\\ a,=2ab\left(a+2\right)\\ b,=\left(y+1\right)\left(x-y\right)\\ c,=\left(x-3\right)\left(2x+5\right)\\ d,=\left(x-1\right)\left(2x+1\right)\\ e,=7x\left(x-y\right)+2\left(x-y\right)^2=\left(x-y\right)\left(7x+2x-2y\right)\\ =\left(x-y\right)\left(9x-2y\right)\\ f,=\left(x^2+4+4x\right)\left(x^2+4-4x\right)\\ =\left(x+2\right)^2\left(x-2\right)^2\\ g,=\left(x-3y\right)^2\\ 2,\\ =x\left(x-y\right)-y\left(x-y\right)=\left(x-y\right)^2\\ =\left(53-3\right)^2=50^2=2500\)
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