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Nguyễn Trần Hoàng Hân
Giới thiệu về bản thân
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1. How often do you lock the safe carefully ?.
2. Where do you keep the safe in the bedroom ?
3. When did the thieves steal everything in it ?
4. Despite being sick, Mary didn't leave the meeting until it ended
5. In spite of living in the same street , we rarely see each other.
Despite being sick, Mary didn't leave the meeting until it ended
Số học sinh giỏi của lớp 5A:
6:3/5=10(HS)
ĐS: 10HS
Gọi số học sinh là x. (x thuộc N*)
Ta có: x chia hết cho 8,10,12
=> x ϵ BC(8,10,12)
BCNN(8,10,12)=48
=> B(48)={48;96,144,192,240,288,...}
Vì 200<x<250
=> x=240.
ĐS: Số học sinh khối 6 là 240 em.
Từ biểu thức trên, ta có: x>0
mà x>0 thì: \(|x+9|=x+9;|x+6|=x+6;|x+2021|=x+2021\)
Vậy:\(|x+9|+|x+6|+|x+2021|< 4x\)
⇒ x + 9 + x + 6 + x + 2021 < 4x
⇒ 3x + 2036 < 4x
⇒ 2036 < x
Vậy gía trị x nguyên nhỏ nhất thỏa mãn là 2037
+ Hai cặp góc so le trong:
góc B1 và góc A3; góc A4 và góc B2 .
+ Bốn cặp góc đồng vị:
góc B1 và góc A1; góc B2 và góc A2; góc B3 và góc A3; góc B4 và góc A4 .
so le trong:
A3 và B1 ;A4 và B2
góc đồng vị:
A3 và B3; A4 và B4; A2 và B2; A1 vad B1