666:2+3
Tính:
a) 6662 . 666
b) 666 + 666 + 666 + 666
c) 666 . 666 . 666 . 666 . 666
d) (666 + 666 - 666) . 666
a) 6662 . 666
= 6663
b) 666 + 666 + 666 + 666
= 666.4
c) 666 . 666 . 666 . 666 . 666
= 666.5
d) (666 + 666 - 666) . 666
= 666.666
= 6662
a)6662.666=6663
b)666+666+666+666=4.666=2664
c)666.666.666.666.666=6665
d)(666+666-666).666=666.666=6662
Chúc bn học tốt
\(\text{a) 666^2 . 666}\)
\(=666^3\)
\(\text{b) 666 + 666 + 666 + 666}\)
\(\text{= 666.4}\)
\(\text{c) 666 . 666 . 666 . 666 . 666}\)
\(=666^5\)
\(\text{d) (666 + 666 - 666) . 666}\)
\(\text{= 666.666}\)
\(=666^2\)
a. (n+1/3)^2=1/25. Tìm n
b. s/s : 2^250 và 33^50
c. s/s : 555^666 và 666^555
a: \(\Leftrightarrow\left[{}\begin{matrix}n+\dfrac{1}{3}=\dfrac{1}{5}\\n+\dfrac{1}{3}=-\dfrac{1}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}n=-\dfrac{2}{15}\\n=-\dfrac{8}{15}\end{matrix}\right.\)
1)tính nhanh
1990 x 1990 - 1992 x 1998
2)tính nhanh
a) 333...3(2014 c/s) x 333...3(2014 c/s)
b) 333...3(2014c/s) x 666...6(2014 c/s)
c) 666...6(2014 c/s) x 666...6(2014 c/s)
1+2+3+4+5+......+x=666
1+2+3+4+5+......+x=666
Suy ra x*(x+1)/2=666(có x số hạng)
Suy ra x*(x+1)=1332
suy ra x=36 hoac x=-37
mà x>0 nên x=36
ai ks cho mình đi mình ks lại gấp 3 lần
Tìm n biết: 1+2+3+4+.....+n=666
1 + 2 + 3 + ... + n = 666
=> ( 1 + n ) . n : 2 = 666
=> n ( n + 1 ) = 1332
Vì 36 . 37 = 1332 .
=> n = 36 .
Vậy n = 36 .
\(1+2+3+4+......+n=666\)
\(\Rightarrow\dfrac{n\times\left(n+1\right)}{2}=666\)
\(\Rightarrow n\times\left(n+1\right)=1332\)
\(\Rightarrow n=16\)
1+2+3+5+6+98+144+666
1 + 2 + 3 + 5 + 6 + 98 + 144 + 666 = ?
= \(\left(1+3+6\right)+\left(2+98\right)+\left(144+666\right)+5\)
\(=10+100+810+5\)
\(=920+5\)
\(=925\)
(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2.................999 x 2 x 2 x 2 ?
A.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 > 999 x 2 x 2 x 2 = 9990 > 7992
B.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 < 999 x 2 x 2 x 2 = 9990 < 7992
C.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 = 999 x 2 x 2 x 2 = 9990 = 7992
(Không báo cáo câu hỏi này!)
(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2.................999 x 2 x 2 x 2 ?
A.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 > 999 x 2 x 2 x 2 = 9990 > 7992
B.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 < 999 x 2 x 2 x 2 = 9990 < 7992
C.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 = 999 x 2 x 2 x 2 = 9990 = 7992
Đáp án A nhé
(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2.................999 x 2 x 2 x 2 ?
A.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 > 999 x 2 x 2 x 2 = 9990 > 7992
B.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 < 999 x 2 x 2 x 2 = 9990 < 7992
C.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 = 999 x 2 x 2 x 2 = 9990 = 7992
tim mot so biet 2/3 cua so do la 666
số đó là :
666 : 2/3 = 999
đáp số : 999
666x666:666+666-666=?????
\(666\times666\div666+666-666=666\times1+0=666\)