Hoàn thành phương trình phản ứng sau : Al-> Al2O3->AlCl3->Al(NO3)3 ->Al(OH) 3 ->Al2O3->Al2(SO4)3->AlCL3

1) a)(x ³-2x ²+3xy ²):(-2x) b)(6x ³-7x ²-x+2):(2x+1) c)(x ²-3x+xy-3y):(x+y) 2) a)x ²-y ²-4x+4 b)x ²-x-2020.2021 3) 2x ²+x+a+1 chia hết x-3 4) 2n ²-n+2 chia hết cho 2n+1 Các bạn làm giúp bài mình nhé.Mình cảm ơn nhiều nhé

câu 1:kể 4 hành vi trái vs lẽ phải câu 2:học sinh cần làm gì để rèn luyện tính tự lập? liên hệ với em

Mn lm giúp mik vs ạ Ng nào lm hay hơn sẽ đc ctlhn

Một HCN có chi vi 550m.Tính cd và CR của hình bt rằng nếu viết thêm chữ số 1 vào trước số đo thì đc số đo chiều dài.

Viết bài văn cảm nghĩ về mái trường

5: Tim GTLN của biểu thức: M = -x^2-y^2 + 4x + 4y + 2.

Bài giải PT khi nào cần chia ra 2 TH, khi nào cần chia ra 1 TH

Cầu 34: I'm tired of GRADE 10 your excuses. A. to hear B. hear C. heard are those who do not have a job. Câu 35: The D. hearing A. injured B. rich Câu 36: The room C. unemployed D. young for weeks. A. cleaned B. hasn't been cleaned C. haven't cleaned D. isn't cleaning Câu 37: My sister is looking forward your country. A. to visit B. visiting C. to visiting D. visit Câu 38: I would rather at home than go out. A. to stay B. staying C. to staying D. stay Câu 39: is it to the post office? - About two hundred meters A. How far B. How long C. How often D. How much Câu 40: 1 to school last Friday. A. wasn't go B. not went C. don't go D. didn't go Câu 41: He to the library every Sunday. B. doesn't go A. don't go C. didn't go D. hasn't gone Câu 42: He a teacher since he from the university. A. was/ had graduated B. had been/ graduated C. was/ has graduated D. has been/ graduated Câu 43: Before he went to bed, he his homework. B. had done C. have done D. did A. has done Câu 44: Are you contented B. for your present job, Mrs. Tuyet? C. with D. of A. to traffic so she was late for the meeting. Câu 45: Peter was stuck in the B. wide C. heavy D. light A. narrow Câu 46: My parents always worry my safety at school. C. about D. to B. in A. at in becoming an Mathematics teacher. C. interested Câu 47: Nancy is D. interestingly A. interest B. interesting Câu 48: A is someone who teaches one student or a very small class. D. scientist C. adviser B. professor A. tutor to bed last night. B. had finished / had gone D. had finished /went our homework before we Câu 49: We A. finished/ went C. finished / had gone Câu 50: We are contented A. of what we have achieved. C. on D. with B. in

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