Cho 2 đường thẳng (d1): 2x - 3y + 1 = 0 và (d2): -4x+6y - 3 = 0 Viết phương trình đường thẳng (d3) song song và cách đều d1, d2

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1.Hạt đậu đen và hạt ngô có những bộ phận nào giống nhau và khác nhau? ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 2/ Hãy cho biết số hạt của quả ở các loại cây có giống nhau không? Vì sao? ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 3/ Quả và hạt do bộ phận nào của hoa tạo thành? Em hãy cho biết những cây nào khi quả đã hình thành vẫn giữ lại bộ phận của hoa?Tên của bộ phận đó ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 4/ Người ta có những cách gì để bảo quản và chế biến các loại quả thịt ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

1)a new air-conditioner will be this morning A installed B to install C installing D to install 2)scientists are looking for an way to reduce energy consumption A effective b affection C effect D effectively 3)we can easily in the daylight A read B to read c reading D readed 4)she won't take all these suitcases she likes to travel light A because B but C so D therefore 5)they are completely short of water now a number of people have died because of this A shortening B short C shortage D shortly 6)she is very tired she has to finish her homework A however B so C and d moreover 7)is he an actor singer? A or B and C with D so 8)he's tired he took a rest before continuing the work A so B and C but D if 9)she forgot off the gas before going out A turning B turn C to turn D turned 10)i suggest money for the poor people in our neighbourhood A saving B to save C save D saved 11)who looks your children when you are away from home? A after B at C for D to 12)there are so grammatical mistakes in this test mr luyen A plenty B many C much D great deal 13)my shoes are dirty i'd better take them before i come in A away B up C on D off 14)if you want to save money you should the amount of water your family uses A increase B reduce C adapt D prepair 15)in oder to save alectricity an ordinary 100-watt light bulb can be replaced by A a 100-watt light B a lamp c an electric bulb D an energy-saving bulb 16) put on the guests on the first floor? A why don't we B i suggest C how about D let's 17)my mother has just bought a house is full of roses A whose garden B the garden C the garden of it D the garden whose 18)today young generation is still fond wearing jeans A about B with c of d on 19)tan dropped his watch when he was the bus A tuming off B getting off C taking off D going off 20)i'll bring a raincoat it rains A so B in case C but d sing