Giải phương trình sau: (4x^2-3x-18)^2 = (4x^2 +3x)^2

1. Dung dịch HCL 25% (D=1,198g/ml). Tính CM a. 7,9M b.6.5M c.8M d.8,2M 2. Muốn pha 400ml dung dịch CuCl2 0,2 M thì khối lượng CuCl2 cần lấy là a. Dung dịch chưa hòa bão b. dung dịch hòa bão c.cả ABC d.dung môi giúp e với ạ hứa vote 5 sâo

Một tia sáng chiếu từ không khí tới mặt thoáng của một chất lỏng với góc tới bằng 450 thì cho tia phản xạ hợp với tia khúc xạ một góc 1050. Góc khúc xạ bằng A. 450. B. 600. C. 300. D. 900.

They will finish the invention before 2021. * 1 điểm A. The invention will be finished before 2021 by them. B. The invention will be finished before 2021. C. The invention will finished before 2021. 17. John was very surprised that he got his mother's letter yesterday. * 1 điểm A. John was very surprised to get his mother's letter yesterday. B. John was very surprised so he got his mother's letter yesterday. C. John was very surprised so that he got his mother's letter yesterday. 18. She pushed the wheelchair to the ambulance for the victim. * 1 điểm A. The ambulance was pushed to the wheelchair for the victim. B. The wheelchair was pushed to the ambulance for the victim. C. The wheelchair was pushed her to the ambulance for the victim. 19. They took their children to Dam Sen park last month. * 1 điểm A. Their children were taken to Dam Sen park by them last month. B. Their children were taken to Dam Sen park last month. C. Their children was taken to Dam Sen park last month. 20. I am very sad because I cannot join the school football team. * 1 điểm A. I am very sad that I cannot join the school football team. B. I am very sad not join the school football team. C. I am very sad but I cannot join the school football team.

Giúp mình bài 2 la mã thôi nhà mình cảm ơn.

Tìm luận điểm cho đề"sách là người bn tốt của con người "

tính nhanh C=-5/12+11/16+-7/12+5/16+6/13 tìm x a) 3/14.x=3/7 b)x-3/6=5/2.1/15 c)x:12/13=-13/12 tính tổng 1/1.2 + 1/2.3 + 1/3.4 +...+1/2018.2019

Các bác giúp em với ạ, em cần gấp, cám ơn các bác nhiều nhiều nhiều <3

Ai làm giúp mình 2 bài này với ạ!

Giúp mik vs Bài kiểm tra 15 ạ Môn sinh ý Phải đúng nha