King 644 Questions 2k Answers 0 Best Answers 20 Points View Profile0 King Asked: Tháng Mười 25, 20202020-10-25T04:47:31+00:00 2020-10-25T04:47:31+00:00In: Môn ToánBài 2: Tính………………0Bài 2: Tính……………… ShareFacebookRelated Questions Giải hộ mình bài 1 đến 7 ạ Giúp vs ạ e cần gấp Hứa vote 5 sao???? Giup em 2 phép tính này với 1. $\frac{234 mũ 4}{117 mũ 4}$ + $\frac{5}{7}$ : $\frac{-5}{2}$ 2. $7^{2x}$ + $7^{2x + ...2 AnswersOldestVotedRecentAmity 670 Questions 2k Answers 0 Best Answers 21 Points View Profile Amity 2020-10-25T04:48:42+00:00Added an answer on Tháng Mười 25, 2020 at 4:48 sáng a) x2 + 2x + 1b) 9 + 6y + y2c) (2x)2 – 1d) x2 + 6x2 + 12x + 8e) 8x3 – 24x2 + 6x – 1f) x3 – 8g) 27x3 – 8h) 8x3 – 12x2 y + 6xy2 – y3i) 16x2 + 24xy + 9y20Reply Share ShareShare on FacebookKhang Minh 645 Questions 2k Answers 0 Best Answers 22 Points View Profile minhkhang 2020-10-25T04:49:10+00:00Added an answer on Tháng Mười 25, 2020 at 4:49 sáng Đáp án:a) (x – 1)² = x² – 2 . x . 1 + 1²= x² – 2 . x + 1b) (3 + y)²= 3² + 2 . 3 . y + y²= 9 + 6 . y + y²c) (2x – 1)(2x + 1)= (2x)² – 1²= 4x² – 1d) (x + 2)³= x³ + 3 . x² . 2 + 3 . x . 2² + 2³= x³ + 6 . x² + 12 . x + 8e) (2x – 1)³= (2x)³ – 3 . (2x)² . 1 + 3 . 2x . 1² + 1³= 8x³ – 3 . 4x² . 1 + 3 . 2x . 1 + 1= 8x³ – 12x² + 6x + 1f) (x – 2)(x² + 2x + 4)= (x – 2)(x² + 2x + 2²)= x³ – 2³= x³ – 8g) (3x – 2)(4 + 6x + 9x²)= (3x – 2)(9x² + 6x + 4)= (3x – 2)[(3x)² + 3x . 2 + 2²]= (3x)³ – 2³= 27x³ – 8h) (2x – y)³= (2x)³ – 3 . (2x)² . y + 3 . 2x . y² – y³= 8x³ – 12xy + 6xy² – y³y) (4x + 3y)²= (4x)² + 2 . 4x . 3y + (3y)²= 16x² + 24xy + 9y²ết gửi bạn nhé~~HỌC TỐT~~#NOCOPY#NOTHINGISIMPOSSIBLE0Reply Share ShareShare on FacebookLeave an answerLeave an answerHủy By answering, you agree to the Terms of Service and Privacy Policy .* Lưu tên của tôi, email, và trang web trong trình duyệt này cho lần bình luận kế tiếp của tôi.
Amity
a) x2 + 2x + 1
b) 9 + 6y + y2
c) (2x)2 – 1
d) x2 + 6x2 + 12x + 8
e) 8x3 – 24x2 + 6x – 1
f) x3 – 8
g) 27x3 – 8
h) 8x3 – 12x2 y + 6xy2 – y3
i) 16x2 + 24xy + 9y2
Khang Minh
Đáp án:
a) (x – 1)²
= x² – 2 . x . 1 + 1²
= x² – 2 . x + 1
b) (3 + y)²
= 3² + 2 . 3 . y + y²
= 9 + 6 . y + y²
c) (2x – 1)(2x + 1)
= (2x)² – 1²
= 4x² – 1
d) (x + 2)³
= x³ + 3 . x² . 2 + 3 . x . 2² + 2³
= x³ + 6 . x² + 12 . x + 8
e) (2x – 1)³
= (2x)³ – 3 . (2x)² . 1 + 3 . 2x . 1² + 1³
= 8x³ – 3 . 4x² . 1 + 3 . 2x . 1 + 1
= 8x³ – 12x² + 6x + 1
f) (x – 2)(x² + 2x + 4)
= (x – 2)(x² + 2x + 2²)
= x³ – 2³
= x³ – 8
g) (3x – 2)(4 + 6x + 9x²)
= (3x – 2)(9x² + 6x + 4)
= (3x – 2)[(3x)² + 3x . 2 + 2²]
= (3x)³ – 2³
= 27x³ – 8
h) (2x – y)³
= (2x)³ – 3 . (2x)² . y + 3 . 2x . y² – y³
= 8x³ – 12xy + 6xy² – y³
y) (4x + 3y)²
= (4x)² + 2 . 4x . 3y + (3y)²
= 16x² + 24xy + 9y²
ết gửi bạn nhé~~
HỌC TỐT~~
#NOCOPY
#NOTHINGISIMPOSSIBLE