một tàu hỏa đang chuyển động thẳng đều với vận tốc 72km/h thì hãmphanh đi chậm dần đều . Sau khi chuyển động thêm 200 m nữa thì dừng lại a) tính gia tốc b) thời gian phanh

tìm số tự nhiên nhỏ nhất biết rằng khi chia số đó cho 36, 40 và 42 được số dư lần lượt là 34, 38 và 40

cho tam giác ABC cân tại A gọi I,K theo thứ tự là trung điểm của AB,AC.Chứng minh tứ giác BIKC là hình thang cân

Lập trình Scratch: vẽ 15 hình lục giác lồng nhau code game Duckienngo2007 giúp mình voái

Chuyên gia,HSG giúp e nhanh nhé và check các câu khác của e nhé <3 Cho x= $\sqrt[3]{\frac{-a}{2}+ {\sqrt{a^{2}/4+1/27}}}$ + $\sqrt[3]{\frac{-a}{2} - {\sqrt{a^{2}/4+1/27}}}$ CMR x ≤ $\sqrt[3]{|a|}$

Em hứa sẽ cho 5 sao nên HSG, Chuyên gia, ai biết làm thì giúp e !!! Tìm x,y,z ∈ Z+ sao cho $\frac{x-y\sqrt{2020} }{y-z\sqrt{2020} }$ ∈ Q Tìm x,y,z để $x^{2} + y^{2} + z^{2}$ là số nguyên tố

1. when you open the safe you (see) a small black box 2. when you (do) 4000 kilometers you can drive it at 70 k.p.h 3. Don't drive at more than 50 k.p.h till your car (do) 4000 kilometers. 4. i can't leave the country till the police ( return) my passport 5 when a bottle of champagne ( be) opened for twenty- four the wine is not fit to drink 6. you ( not know) how good oysters are till you have tasted one. 7. that road will not be safe till the floods (subside ) 8 As soon as everybody has gone to bed the mice (come) out of their holes.

Put the expression from the box into the correct category in the table below make a mistake a storm of tea cup live music check point key ring pull somebody's leg heavy snow valid passport teapot bitterly disapointed Compound | Collocation | Idiom

Cho x= $\frac{1}{3}(\sqrt[3]{23+\sqrt{513}/4}+\sqrt[3]{23-\sqrt{513}/4}-1)$ Tính 2x^3+ 2x^2+1 Giải chi tiết giúp e

Put the verbs in the brackets in the corest tense 26 If you hadn't been in such a hurry you (not put) sugar into the sauce instead of salt. 27 If I (be) ready when he called he would have taken me with him. 28 She had a headache; otherwise she (come) with us. 29 If she had listened to my directions she (not turn) down the wrong street. 30 If you (look) at the engine for a moment you would have seen what was missing. 31 Rome (be captured) by her enemies if the geese hadn't cackled. 32 He would have been arrested if he (try) to leave the country. 33 I (take) a taxi if I had realized that it was such a long way. 34 You (save) me a lot of trouble if you had told me where you were going. 35 They would have forced their way into the house if I (not call) for help. 36 If he had put out his pipe before putting it in his pocket he (not burn) a hole in his coat.