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nhungtran0502
2 năm trước
Bài 2: Tính theo n giá trị của các biểu thức sau : A= 1/(1.5)+1/(5.9)+⋯+1/[(2n-2)(2x+2)] B = 1 – 2 + (2^2)-(2^3)+⋯+(-2)^n C = 1/(4^0) +1/(4^1)+1/(4^2) +⋯+1/(4^n)
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1.He usually (watch)..................................TV but sometimes he (read)............................book. 2.We (not go).................................to the zoo very often. 3.Lan and Phong(be).............................in the kitchen.they (cook)..............................dinner. 4.What about (play)......................................soccer this after school? 5.My sister (be)......................................in the garden.She (water)............................the flowers. 6.Be quiet! I(study)................................... 7.Look! the plane(fly)...................................toward the airport. 8.We'll go out when the rain (stop)........................................ 9.I (stay).............................here until he (answer)...............................me. 10.Listen ! birds.....................................(sing) 11. When I was a child, I used to (study)...............................hard.

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