B = ( -$\frac{3}{4}$$x^{5}$$y^{4}$ ) . ( $xy^{2}$ ) . ( -$\frac{8}{9}$$x^{2}$$y^{5}$ ) Thu gọn, tìm bậc của đơn thức

41. It's years since I took photographs.  I haven’t _____________________________________________ 42. I last watched TV on new years's day.  I haven’t ___________________________________________________ 43. It's 3 months since he wrote to me.  He hasn’t ______________________________________________ 44. The last time I was aboard was in the summer of 1978.  I haven’t _______________________________________________ 45. It's ten years since that house was lived in.  That house ____________________________________________ 46. I haven't seen him for 2 months.  I last _________________________________________________ 47. I haven't been to a concert for over a year.  The last time ________________________________________ 48. The last time I really enjoyed myself was your birthday party.  I haven’t ____________________________________________ 49. It's nearly 20 years since my father saw his brother.  My father hasn’t ________________________________________ 50. When did you learn to drive?  How long ____________________________________________________ 51. The last time I went swimming was when we were in Spain.  I haven’t __________________________________________ 52. You haven't tidied this room for weeks.  It’s weeks since__________________________________________ 53. We started looking for a flat 2 months ago and we are still looking.  We have ____________________________________________ 54. This is the first time I've been to a night club  I haven’t _________________________________________ 55. They have never heard such a thing before.  This is the first time ____________________________________ 56. No one has challenged his authority before.  This is the first time __________________________________ 57. She left university 2 years ago  It is 2 years since ________________________________________ Bài tập viết lại câu thì hiện tại hoàn thành và quá khứ đơn

b , 4x - 3 = -2x +9 c , -4 ( x- 2 ) = 7 - ( 3x - 1 ) d , 4 ( 2x + 1 ) ² - 5 = 95 Cần gấp lắm ạ

làm tròn số 5,4169605 đến chữ số thập phân thứ 2

Giúp em với em cảm ơn ạ em cần gấp

Júp e zới mn ơi ghi từng chi tiết ra nhé

vẽ đậu mầm cute hột me nl:vn cố lên

giúp mình bài này ạ owo nl : làm đủ nha mng .-. có thể làm tắt nhưng phải đúng ạ < kthuc lp 8 đang ôn lại TvT >

vẽ mầm trầm karm NL : có câu dễ mà cx ghi cấu trúc sai :> may là sửa kịp ko pay mất câu trl + cái hay nhất hic

Calli : chúc mừng Tradi, có tâm UvU NL : Làm tròn đỉm nè nên ai đẹp sẽ đc hn nè ;)