"Những hằng đẳng thức đáng nhớ": 1. Tính: a, (x+5)^2 b, (3x-2)^2 c, (4x-1).(4x+1) d, (x-3).(x+3) CTLHN luôn @@!!!

Mọi người giúp em hai bài này với ạ

A lot of vs lots of dùng is hay are

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"Những hằng đẳng thức đáng nhớ": 1, Tính (bỏ dấu ngoặc) a, (x+2y)^2 b, (3x-1).(3x+1) c, (2x-y)^2 d, (1/2x+y).(1/2x-y) CTLHN luôn @@

Làm giúp mình vs mọi người Cảm ơn!!!!!

Giúp mik câu 2 nha mn hứa vote 5 saoo lun

Giúp mik câu 1 vs ạ hứa vote 5 sao

IX. Finish the sentences in such a way that it means the same as the given one 41. The children should not stay up late -> The children ought to…………………………………………………………………………….. 42. How high is the Big Ben Clock Tower? -> What is……………………………………………………………………………………………. 43. How long is the Mekong River? -> What is…………………………………………………………………………………………….. 44. I haven’t seen her at this club before -> This is the first time I …………………………………………………………………………….. 45. Bill last called me five days ago -> Bill hasn’t………………………………………………………………………………………….

Uyen Phuong, a stylists has not designed new styles of Ao Dai for 6 months. -> It's been about.........