b) `4x^2-4x-3`
`=(4x^2-4x+1)-4`
`=(2x-1)^2-4`
`=(2x-1-2)(2x-1+2)`
`=(2x-3)(2x+1)`
c) Sửa đề
`4x^2+4x+1`
`=(2x-1)^2`
d) `x^2-4xy-5y^2`
`=(x^2-4xy+4y^2)-9y^2`
`=(x-2y)^2-9y^2`
`=(x-2y-3y)(x-2y+3y)`
`=(x-5y)(x+y)`
`b) 4x^2 - 4x - 3`
`= (2x)^2 - 4x + 1 - 4`
`= ( 2x - 1)^2 - 2^2`
`= ( 2x - 3)(2x + 1)`
`c) 4x^2 + 4x - 1` ( Không thể phân tích )
Sửa : `4x^2 + 4x + 1`
`= ( 2x)^2 + 2 . 2x + 1^2`
`= ( 2x + 1)^2 `
`d) x^2 - 4xy - 5y^2`
`= x^2 - 4xy + 4y^2 - 9y^2`
`= ( x - 2y)^2 - ( 3y)^2`
`= ( x - 2y + 3y)(x - 2y - 3y)`
`= ( x + y)(x - 5y)`
1.been/have/goods/the/2000/supplized/that/company/since/by 2.company/twenty/worked/father/years/for/for/my/has/this
giải pt sau với x là ẩn , a,b,c là tham số $\frac{a+b-x}{c}$ + $\frac{b+c-x}{a}$ + $\frac{c+a-x}{b}$ + $\frac{4x}{a+b+c}$ = 1
Mn giúp mik nha, mik đag cần gấp
His interest is English. (He is ...) _________________________________________ 42 They take part in outdoor activities. (participate) _________________________________________ 43 He takes care of sick children. (look after) _________________________________________ 44 They take part in playing marbles. (join in) _________________________________________ 45 Let's go to the zoo. (How about ...?) _________________________________________ 46 Let's go swimming. (What about...?) _________________________________________ 47 Let's play chess tonight. (Why...?) _________________________________________ 48 Why don't you listen to music? (Let's ...) _________________________________________ 49 Would you like to go to the cinema with me tonight? (How about..?) _________________________________________ 50 How about going by car? (Let's ...)
helppppppppppppppppppppppppppppppppppppppppppppppppppppp
5.4 mũ 15 .9 mũ 9 - 4.3 mũ 20 .8 mũ 9 và B = 5.2 mũ 9 .6 mũ 19 - 7.2 mũ 29 .27 mũ 6 .Tính A : B = ?
Viết đoạn văn ngắn , nêu vẻ đẹp và thân phận của ng phụ nữ trong bài thơ bánh trôi nước của Hồ xuân hương.
Mọi người giúp mình với mình cảm ơn
Giải hộ e với, ko trình bày tắt nha: (0,16 - x).188 + 80x = 23,6
14.The referee had no hesitation in awarding the visiting team a _______.a. penalty b. penalize c. penal d. penalization 15.The referee's _______ is the most important in any sport competition.a. decide b. decisive c. decision d. decider 16.Johnny used to be one of the most _______ athletes in my country.a. succeed b. success c. successful d. successfully 17.The success of the 22nd SEA Games had a great contribution of many ____ volunteers.a. support b. supporter c. supportive d. supportively 18.He was so _______ that he could not even say a word.a. nerve b. nerves c. nervous d. nervously 19.I am really _______ in the way he talks, but the way he behaves.a. interest b. interested c. interesting d. interestingly 20.Thanks to labor-saving devices, women have more time to takepart in _______ activities.a. society b. social c. socially d. socializeGrade Mn giúp mình với ạ chỉ cần ghi đáp án và giải thích (cách làm ) . Cảm ơn
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
