Toán Lớp 8: Rút gọn biểu thức sau: (a + 3) (a ² - 1) - (a + 3) (a ² - 3a + 9) cần gấp nha mn!

(a+3)(a^2-1)-(a+3)(a^2-3a+9) =a.a^2-a.1+3.a^2-3.1-(a^3+3^3) =a^3-a+3a^2-3-a^3-27 =(a^3-a^3)+3a^2-a+(-3-27) =3a^2-a-30 * a^3+b^3=(a+b)(a^2-ab+b^2)

(a+3)(a^2-1) - (a+3)(a^2-3a+9) = (a+3)(a^2 - 1 - a^2 + 3a -9) = (a+3)(3a - 10) = a(3a-10) + 3(3a-10) = 3a^2 - 10a + 9a - 30 = 3a^2 - a - 30

Toán Lớp 8: Rút gọn biểu thức sau: (a + 3) (a ² - 1) - (a + 3) (a ²

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