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ta có
12345678=1+2+3+4+5+6+7+8=36:hết cho 6(tổng 1 số chia hết 3 mà là số chẵn thì chia hết cho 6)
........
81234567: cho 6
=>biểu thức trên chia hết cho 6
Bạn j ơi, bạn hiểu sai ý mình rồi.
Ý mình là bạn phải tính biểu thức này cơ.
Chúc bạn may mắn lần sau.
theo mình nghĩ là như th61 này
\(2\cdot2^{99}-2^{99}=2^{99}\)
\(2^{99}=2\cdot2^{98}\)
\(2\cdot2^{98}-2^{98}=2^{98}\)
vậy tức là \(2^n-2^{n-1}=2^{n-1}\)
đến cuối bạn sẽ có \(2^3-2^2=4\)
4-2-1=1
sometimes /weekends/ we/ the/ go/ at/ camping.
A. We go sometimes camping at the weekend.
B. Sometimes we go the camping at weekend.
C. We sometimes go camping at the weekend.
D. At the weekend we go sometimes camping.
it/ very/ to/ is/ interesting/ join/ school/in/ my/ chess/ the/ club/ in.
A. It is very interesting to join the chess club in my school.
B. It is very interesting to join chess club in the my school.
C. It very is interesting to join the chess club in my school.
D. It very is interesting to join the chess in my school club .
hard-working/ Lam/ is/ student/ class/ intelligent/ in/ an/ my/ and.
A. Lam is an hard-working and intelligent student in my class.
B. Lam is an intelligent and hard-working student in my class.
C. Lam is an intelligent and hard-working in my student class.
D. Lam is hard-working and an intelligent student in my class.
at/ teacher/ teaching/ us/ is/ our/ Maths/ the/ moment.
A. At the moment us teacher is teaching our Maths.
B. Our teacher at the moment is teaching Maths us.
C. Our teacher is teaching us Maths at the moment.
D. Our teacher is teaching Maths us at the moment.
eyes/ sister/ my/ is/ she/ younger/ and/ short/ has/ round.
A. My younger sister is short and she has round eyes.
B. My sister is younger and she has short round eyes.
C. My younger sister is round and she has short eyes.
D. My sister is younger and she has short round eyes.
a,
AB=OB-OA=4-1=3cm
AC=OC-OA=7-1=6cm
BC=OC-OB=7-4=3cm
b,
AB+BC=3+3=6cm=>AB+Bc=AC=6cm
B là trung diểm của AC .Vì AB=BC
S=−(a−b−c)+(−c+b+a)−(a+b)
S=−a+b+c−c+b+a−a−b
S=(−a+a−a)+(b+b−b)+(c−c)
S=−a+b
never chuẩn luôn đó
won't phải ko nhỉ