tìm a,b,c biết a^2+b^2+c^2+d^2=1 và ab+bc+cd+da=1

Phân tích các nhân tố giao tiếp trong hoạt động giao tiếp mua bán ở chợ

bài 1:tìm x bằng phân tích đa thức thành phân tử bằng phương pháp nhóm hạng tử 1)7x(x-4)-x+4=0 2)x^3-3x^2+x-3=0 3)x^3-2x^2-9x+18=0 4)3x(x-1)+x-1=0 5)2(x+3)-x^2-3x=0 6)6x^2-15x-(2x-5)(x+5)=0 giúp em hứa vote 5 sao ạ

giúp tui vs He finds it ________ lasting friendships. a. difficult to make b. difficulty in making c. is difficult to make d. difficult making You ________ any friends if you ________ talking like that. a. will win/ carryon b. won't win/ carryon c. wouldn't win/ carried on d. would have won/ had carried on The aim of the culture festival is ________ friendship between the two countries a. promote b. promoting c. to promote d. being promoted People he ________ turned out to be only fair-weather friends. a. trusted b. has trusted c. was trusting d. had trusted How can you let such a silly incident ________ your friendship? a. wreck b. to wreck c. wrecking d. that wrecks It has become necessary ________ water in the metropolitan area because of the severe drought. a. rationing b. ration c. to ration d. to have rationed All the passengers were made ________ their seat belts during the turbulence. a. buckle b. to buckle c. buckling d. for buckling. ________ good ice cream, you need to use a lot of cream. a. Make b. Making c. To make d. For make I got my friend ________ her car for the weekend. a. to let me to borrow b. to let me borrow c. let me borrow d. let me to borrow They _______ good friends, but they've fallen out recently. a. used to be b. would be c. were d. are Instead of buying a new pair of shoes, I had my old ones _________ . a. repair b. to repair c. repairing d. repaired It's possible _______ a train across Canada. a. take b. to take c. taking d. to be taken Now that we've finished painting the house, there is nothing left ________. a. to do b. for doing c. to be done d. for being done Before we leave, let's have Shelley _____ a map for us so we won't get lost. a. draw b. to draw c. drawing d. drawn I can hear a cat ________ at the window. a. scratches b. to scratch c. scratching d. was scratching I think your mother should let you __________ your own mind. a. make up b. to make up c. making up d. made up The police never found the money __________in the robbery. a. stealing b. be stolen c. steal d. stolen

viết một bài văn giới thiệu về sở thích của em . Ai viết hay hứa 5 sao . ( sở thích ở đây là đọc sách)

Giải chi tiết câu này giúp e với ạ

GIÚP EM VỚI Ạ...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Trình bày sự tiến hóa Hệ Tiêu Hóa của động vật từ động vật không xương sống đến động vật có xương sống

Giải giúp mik chi tiết bài này nhé <3 Thanks nhìu :)))

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