$2x(2x-1)^2-3x(x-3)(x+3)-4x(x+1)^2\\=2x(4x^2-4x+1)-3x(x^2-9)-4x(x^2+2x+1)\\=8x^3-8x^2+2x-3x^3+27x-4x^3-8x^2-4x\\=(8x^3-3x^3-4x^3)+(-8x^2-8x^2)+(2x+27x-4x)\\=x^3-16x^2+25x$
Vậy $2x(2x-1)^2-3x(x-3)(x+3)-4x(x+1)^2=x^3-16x^2+25x$
Đáp án+Giải thích các bước giải:
`a)2x(2x-1)^2-3x(x+3)(x-3)-4x(x+1)^2`
`=2x(4x^2-4x+1)-3x(x^2-9)-4x(x^2+2x+1)`
`=8x^3-8x^2+2x-3x^3+27x-4x^3-8x^2-4x`
`=x^3-16x^2+25x`
M.n ơi giúp mình 4 bài này vs ạ mình sắp nộp r pls
18. Tìm x, biết : 4(x + 1)^2+ (2x -1)^2 - 8(x 1)(x + 1) = 11. Bài 18 Giúpppppppppppppppppppppppppppppp
Giải chi tiết cho mình 4 (lý thuyết) câu này nhé
Mới tập viết calligraphy thì dùng bút gì vậy ạ Kèm ảnh giúp nhé
Viết lại các câu sau theo cấu trúc cau điều kiện 1. She cannot cook because she feels very tired today 2.he was so timid in love , so he lost her 3.jane helps me survey the market so I plan to share a commission with her 4.You cannot understand me because you are a rich man 5. TIM drink too much alcohol every day , that's why he is hospitalized for treatment 6.Kate lioe K-pop music , so she spends the money to buy tickets for the concert 7. He has many beloved girls , that's why he becomes so arrogant 8. My health improves improves better because I exercise daily 9.I didn't eat dinner with everyone , so I feel very hungry now 10.He got fied because he was too lazy 11.Stay away from this place or I'll report the area's secueity 12. You aways complain about everything that happens in your life , that's why I never want to work in a team with you 13. Follow the instructions or you will ruin everything. 14.people will not go camping in this stormy weather 15. I love art , that's why I organized this axhibition
Chứng minh rằng A=1/2 - 2/2^2 + 3/2^3 - 4/2^4 + ...99/2^99 - 100/2^100 < 2/9
Giải chi tiết cho mình 3 câu này nhé
Giúp e với ạ chỉ cần đáp án thui nhe
Mọi người làm giúp em với ạ 🙏🙏🙏🙏
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