因式分解(1)(4x-3)(5x^2-4x+7) (2)(3a-2)(a-1)+(a+1)(a+2)
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因式分解(1)(4x-3)(5x^2-4x+7) (2)(3a-2)(a-1)+(a+1)(a+2)
因式分解(1)(4x-3)(5x^2-4x+7) (2)(3a-2)(a-1)+(a+1)(a+2)
因式分解(1)(4x-3)(5x^2-4x+7) (2)(3a-2)(a-1)+(a+1)(a+2)
(1)(4x-3)(5x^2-4x+7)
=20x³-15x²-16x²+12x+28x-21
=20x³-31x²+40x-21
(2)(3a-2)(a-1)+(a+1)(a+2)
=3a²-2a-3a+2+a³+3a+2
=4a²-2a+4
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