Toán Lớp 8: a) 4a^3b.(3ab-b+1/4) b) (ax^2+bx-c).2a^2x c) -4x^2(6x^3+5x^2-3x+1) -

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Toán Lớp 8: a) 4a^3b.(3ab-b+1/4) b) (ax^2+bx-c).2a^2x c) -4x^2(6x^3+5x^2-3x+1)