người ta giảm 4 cạch của một thửa ruộng hình vuông đi 3,5m thì diện tính thưởng ruộng đó giảm đi 78,75m2 . tính diện tích thửa ruông ban đầu (vẽ hình trước khi giải )

Những điều kiện cho nền nông nghiệp bắc mĩ phát triển

Nhà nước pháp quyền là một nhà nước quản lí mọi mặt của đời sống xã hội bằng gì

Cho đoạn thẳng AB = 6cm. Gọi C là một điểm nằm giữa A và B . Gọi M là trung điểm của CA , N là trung điểm của CB. Tính MN.

Giúp mình với bạn ơi mình cảm ơn bạn nhé

Give the correct verb forms: 80.Mai and Hang (not play) ......................... the game at the moment. 81.I often (wash) ......................... my clothes. 82.She (not be) ......................... at home now. 83.You often (write) .........................to your friend? 84.Mr.Mai (water) ......................... the plant evey morning. 85.We (meet) ......................... each other twice a month. 86.He (listen) ......................... to the telephone at the moment. 87.They always (not go) .........................to the school by train. 88.He (drink) ......................... beer at the bar at the moment. 89.They usually (sing) ......................... in the early morning. 90.Mi and Thanh (talk) ......................... on the telephone now? 91.They (plant) .........................trees in the early year. 92.He (not study) ......................... Math at the moment. 93.She (play) ......................... badminton every afternoon? 94.They sometimes (do) ......................... morning exersices at 5.30. 95.Thanh and I (be) ......................... at home now. 96.Hung (run) ......................... about 5 km every morning. 97.Hung and Minh sometimes (meet) .........................each other? 98.Every evening, she (jog) .........................about 3 km. 100. He always (drive) .........................his car to work. But now, he (ride) .........................his motorbike to work.

Giúp em với em có để hình ở đây Em đan cần gấp xin cám ơn

Giai đoạn sau của xã hội CSCN được gọi là gì

Give the correct verb forms: 39.He (not be) ......................... at home now. 40.Hanh (not read) ......................... book at the moment. 41.Our teacher usually (give) .........................us many exersices. 42.He often (catch) ......................... a train to work. 43.The cat (catch) ......................... mouse. 44.They (plant) .........................trees overthere at the moment. 45.My old friend, Manh (write) ......................... to me twice a month. 46.What she says (be) ......................... true. 47.Where she (buy) ......................... her breakfast every morning? 48.Bi often (not phone) ......................... to me. 49.Mrs.Green always (take) ......................... a bus to work. But now she (drive) .........................to work. 50.Look! The ball (fall) .........................down. 51.He usually (water) ......................... the trees in the morning. 52.She (not listen) .........................to the radio now. 53.The sun (rise) ......................... in the East and (set) ......................... in the West. 54.He (play) .........................table tennis at the moment. 55.Mo and Nguyen (sing) ......................... the same song now. 56.They always (make) ......................... noise in the class. 57.Hung often (not go) ......................... camping in the summer. 58.Hanh (not read) ......................... with the friends at the moment. 59.Son (write) .........................to their friends every summer holiday? 60.What .........................you (listen) .........................on the radio? 61.Listen! Someone ......................... (cry). 62.Kien and Tuyen (be) .........................good students. 63.She (go) ......................... to work by bus tomorrow. 64.You (see) ......................... the doctor next week? 65.Mai and Nam (go) ......................... to the movie theater tomorrow evening. 66.They (plant) ......................... trees a long this street next month. 67.He (write) ......................... to his friend next week. 68.They (not be) ......................... doctors. 69.He often (pick) ......................... his friend up at the train way station morning. 70.He (watch) ......................... a romantic film on TV this evening. 71..........................You often (do) ......................... your homework in the evening? 72.I (read) .........................an interesing novel at the moment. 73.You usually (watch) .........................TV in the evening? 74.They always (talk) .........................to each other in the weekend. 75.They (play) ......................... soccer at the moment. 76.She often (not go) ......................... (shop) .........................on weekend. 77.They (not be) .........................classmates. .........................He (be) .........................your father? 78.She (listen) .........................to music now? 79.Thanh and Hung (read) ......................... a wonderful story at the moment.

Nhiệt phân 12,64 gam KMnO4 thu được một lượng khí O2. Lấy lượng khí O2 vừa thu được đốt cháy hoàn toàn một lượng Fe tạo thành Fe3O4. Tính khối lượng Fe3O4