1.Rút gọn

a,\(\left(3x-5\right)\left(9x^2+15x+25\right)\)

b,\(\left(2x+7\right)\left(x^2-14x+49\right)-2x\left(2x-1\right)\left(2x+1\right)\)

c,\(\left(4x-7\right)\left(16x^2+28x+49\right)\)\(\left(3x+1\right)\left(9x^2-3x+1\right)-9x\left(3x^2-1\right)\)

d,

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