5 -(-6) -(-46)
\(A=5^{50}-5^{48}+5^{46}-5^{44}+...+5^6-5^4+5^2-1\)
\(A=\left(5^{50}-5^{48}\right)+\left(5^{46}-5^{44}\right)+...\left(5^6-5^4\right)+\left(5^2-1\right)\)
\(A=5^{50}\left(1+5^2\right)+5^{46}.\left(1+5^2\right)+...+5^6.\left(1+5^2\right)+5^2.\left(1+1\right)\)
\(A=5^{50}.26+5^{46}.26+...+5^6.26+5^2.2\)
\(A=26.\left(5^{50}+5^{46}+...+5^6+5^2\right)\)
Vì \(26.\left(5^{50}+5^{46}+...+5^6+5^2\right)\)chia cho 100 dư 26
Và 5 chia cho 100 dư 5
nên \(26.\left(5^{40}+5^{46}+...+5^6+5^2\right)\)chia cho 100 dư 21
57 : 5=? 82 : 6=? 46 : 5=? 38 : 4=? 68 : 3=?
57:5=11 dư 2 82:6= 13 dư 4 46:5=9 dư 1 38:4=9 dư 2
68:3=22 dư 2
57 : 5=11(dư 20
82 : 6=13(dư 4)
46 : 5=9(dư 1)
38 : 4=9(dư 2)
68 : 3=22(dư 2)
57 : 5=11(dư 2)
82 : 6=13(dư 4)
46 : 5=9(dư 1)
38 : 4=9(dư 2)
68 : 3=22(dư 2)
46-6.(x-3)=2mu3 . 5
\(46-6\left(x-3\right)=2^3.5\)
\(\Rightarrow46-6\left(x-3\right)=40\)
\(\Rightarrow6\left(x-3\right)=6\)
\(\Rightarrow x-3=1\Rightarrow x=4\)
bài 1 : sắp xếp theo thứ tự :
a) lớn dần : 3/46 ; 9/7 ; 8/46 ; 9/9
b) bé dần 9/10 ; 6/5 ;6 /6 ;8/7
c)bé dần : 4/5 ; 20 /9 ; 5/8 ; 60 /60
a)3/46;8/46;9/9;9/7
b)9/10;6/6;8/7;6/7
c)20/9;60/60;4/5;5/8
giải thích giõ ví dụ :
ta quy đống : .....................................................được
mà : ...........................................................nên ..................................
vậy các phân số được viết theo thứ tự :......................................................
6/3 nhân5+6/5 nhân 7+6/7 nhân 9...+6/46 nhân 49
Sos
Biết C=5^50-5^48+5^46-5^44+...+5^6-5^4-5^2-1
25C=5^52-5^50+5^48-5^46+...+5^8-5^6+5^4-5^2
=>26C=5^52-1
=>\(C=\dfrac{5^{52}-1}{26}\)
Đề đúng rồi đúng ko em? Nghĩa là 2 số hạng cuối là \(-5^2-1\) chứ không phải \(+5^2-1\)?
\(C=5^{50}-5^{48}+5^{46}-5^{44}+...+5^6-5^4-1\)
\(=5^{48}\left(5^2-1\right)+5^{46}\left(5^2-1\right)+...+5^4\left(5^2-1\right)-5^2-1\)
\(=5^{48}.24+5^{46}.24+...+5^4.24-25-1\)
\(=5^{46}.5^2.24+5^{44}.5^2.24+...+5^2.5^2.24-26\)
\(=5^{46}.600+5^{44}.600+...+5^2.600-100+74\)
\(=100.\left(5^{46}.6+5^{44}.6+...+5^2.6-1\right)+74\)
Vậy C chia 100 dư 74
5/6 nhân 2/3 + 3/2 nhân 3/5 + 46/5
\(\frac{5}{6}.\frac{2}{3}+\frac{3}{2}.\frac{3}{5}+\frac{46}{5}\)
\(=\frac{5}{9}+\frac{9}{10}+\frac{46}{5}\)
\(=\frac{50}{90}+\frac{81}{90}+\frac{828}{90}\)
\(=\frac{959}{90}\)
ta có\(\frac{5}{6}\)* \(\frac{2}{3}\)+\(\frac{3}{2}\)*\(\frac{3}{5}\)+\(\frac{46}{5}\)=\(\frac{10}{18}\)+\(\frac{6}{10}\)+\(\frac{92}{10}\)=\(\frac{98}{10}\)+\(\frac{10}{18}\)=10\(\frac{16}{45}\)
(2+2x).3 5/6=46
\(\left(2+2x\right)\cdot3\dfrac{5}{6}=46\)
\(\left(2+2x\right)\cdot\dfrac{23}{6}=46\)
\(2+2x=46:\dfrac{23}{6}\)
\(2+2x=46\cdot\dfrac{6}{23}\)
\(2+2x=12\)
\(2x=12-2\)
\(2x=10\)
\(x=10:2\)
\(x=5\)
Vậy \(x=5\).
(2+2x) . 3 5/6 = 46
=> (2+2x) . 23 = 46
=> 2 + 2x = 46 : 23
=> 2 + 2x = 2
=> 2x = 0
=>x = 0
( 2 + 2x ) . \(3\dfrac{5}{6}\)= 46
( 2 + 2x ) . \(\dfrac{23}{6}\)=46
2 + 2x = 46 : \(\dfrac{23}{6}\)
2+ 2x = 12
2x = 10
x = 5
46 - 6 . ( x - 3) = 2 mũ 3 . 5