Cho mk hỏi một câu nhé , ai là ny Hạnh cute vậy ?
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Every morning from Monday to Saturday, I get up at 6 o'clock. After breakfast, I go to school by bicycle. It takes me about 20 minutes from my house to my school. Usually, I study at school until 11:30 a.m. I return home at noon to have lunch with my family. In the afternoon I attend English and computer courses. I always get home just in time for dinner at 7:30 p.m. After dinner, while my parents are watching television in the living-room, I read books or prepare for school in my own room.
I am free at weekends. On Sunday mornings, I get up later than usual. Then I often go shopping downtown with my friends. Sometimes we go for a picnic in the countryside. On rainy Sundays, I stay at home reading books and listening to music.
I am quite happy with my daily activities.
1 + 2 + 3 + 4 + 5 +...+ x = 1540 giúp mk nhé ai nhanh mk tick cho ai trả lời lm ny mk ( nếu là trai)
\(1+2+3+4+5+...+x=1540\)
Ta có :
\(\frac{x\cdot\left(x+1\right)}{2}=1540\)
\(x\cdot\left(x+1\right)=1540\cdot2\)
\(x\cdot\left(x+1\right)=3080\)
Vì \(x\cdot\left(x+1\right)\)là tích của hai số tự nhiên liên tiếp
\(\Rightarrow55\cdot56=3080\)
Vậy \(x=55\)
Ta có: 1+2+3+4+5....+x=1540
=> \(x\times\left(x+1\right):2=1540\)
\(\Rightarrow x\times\left(x+1\right)=3080\)
Vì 55 x 56 = 3080
Nên x = 55
thi click vao bieu tuong la thu roi nhap vao tin nhan la dc
don't know
là sao?