Rút gọn biểu thức: (3x+y) 9x^2- 3xy+ y^2 -(3x-y)^3- 27x^2 .y

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Làm bài này giúp em nha ! Em cảm ơn

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rút gọn biểu thức: -5x(x-5)+(x-3)(x²-7)

Làm hộ mik cái,nhớ lời giải nha các bạn

Đề là Tìm giá trị lớn nhất của các biểu thức sau Mọi ngừoi giúp em với ạ , hứa bote 5 sao ✨✨

rút gọn, tính giá trị biểu thức chứa căn bậc 2 p = ( 1/1- √a - 1/1+ √a ).(1-1/ √a)

trong những vật sau đây vật nào phản xạ âm tốt nhất a. ko khí b. mềm, gối c. rèm cửa d. cửa kính

The children can read English,..........................? He's ten years old , ...........................? Ba came on a bicycle , ............................? The Smiths have got a car , ..................................? Your grandfather was a millionaire , .................................? Tom should try again , ...............................? It could be done , ........................? Your brother 's here, ................................? That's Tim over there , ....................................? This will fit in your pocket,..............................? His wife has headaches quite often , ..............................? She 's got lovely blue eyes ,...............................? Prices keep going up ,..............................? I've seen you before ,.............................? Bill's written a novell ,...............................? His mother 's very proud of him ,............................? The twins used to play rubby , ...........................? Tom might be at home now ,..........................? We must hurry ,.............................? You'd been there before , ...............................? I'd like a drink,...............................? Mary ought to cooked it for them , .................................? That was Ann on the phone ,.............................? The Smiths need two cars , ..............................? He used to eat raw fish ,..........................? You'll help me ,.................................? There'll be plenty for Bill,...............................? You 'd better wait for Bill ,............................? You'd come if I needed help,................................? You'd come at short notice ,............................?