Toán Lớp 8: 7 hàng đang thuc helppppppppppppppppp
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Toán Lớp 8: 7 hàng đang thuc helppppppppppppppppp
Comments ( 2 )
(a+b)^2 = a^2 + 2ab + b^2
(a-b)^2 = a^2 – 2ab + b^2
a^2 – b^2 = (a-b)(a+b)
(a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3
(a-b)^3 = a^3 – 3a^2b + 3ab^2 – b^3
a^3 + b^3 = (a + b)(a^2 – ab + b^2)
a^3 – b^3 = (a – b)(a^2 + ab + b^2)
Giải đáp + giải thích các bước giải:
1) (A + B)^2 = A^2 + 2AB + B^2
2) (A – B)^2 = A^2 – 2AB + B^2
3) A^2 – B^2 = (A – B)(A + B)
4) (A + B)^3 = A^3 + 3A^2B + 3AB^2 + B^3
5) (A – B)^3 = A^3 – 3A^2B + 3AB^2 – B^3
6) A^3 – B^3 = (A – B)(A^2 + AB + B^2)
7) A^3 + B^3 = (A + B)(A^2 – AB + B^2)