b) ( 169 - 1 ) . ( 169 - 3 mũ 2 ) ....... ( 169 - 12 mũ 2 ) . ( 169 - 13 mũ 2 )
bài 6
2 + 4 +6 + ... + 2012 +2013 b (169 - 1) * (169 - 22) * (169 - 32 ) ... (169 - 12 ) * (169- 13 )
12 là 12 mũ 2
13 là 13 mũ 2
(169 - 4 mũ 2) (169 -5 mũ 2) ...( 169 - 13 mũ 2)
(169 - 4 mũ 2) (169 -5 mũ 2) ...( 169 - 13 mũ 2)
= (169-42)(169-52)...(169-132)
=(199-42)(169-52)...(169-169)
=_____________...0
= 0
Tính
A)27 mũ 7 :9 mũ 10
B)125 mũ 6 : 25 mũ 7
C)5 mũ 15 :5 mũ 3
D)11 mũ 7 : 11 mũ 3
E)125: 5 mũ 2
G)169: 13 mũ 2.
a) \(27^7\div9^{10}\)
\(=\left(3^3\right)^7\div\left(3^2\right)^{10}\)
\(=3^{3\times7}\div3^{2\times10}\)
\(=3^{21}\div3^{20}\)
\(=3^1\)
\(=3\)
b) \(125^6\div25^7\)
\(=\left(5^3\right)^6\div\left(5^2\right)^7\)
\(=5^{3\times6}\div5^{2\times7}\)
\(=5^{18}\div5^{14}\)
\(=5^4\)
\(=625\)
c) \(5^{15}\div5^3\)
\(=5^{12}\)
\(=244140625\)
d) \(11^7\div11^3\)
\(=11^4\)
\(=14641\)
e) \(125\div5^2\)
\(=5^2\div5^2\)
\(=5^1\)
\(=5\)
g) \(169\div13^2\)
\(=13^2\div13^2\)
\(=13^1\)
\(=13\)
Tìm x:
13 . (7x- 49) - 169= 13 mũ 5 : 13 mũ 4
13.(7x—49)—169=135:134
13.(7x—49)—169=13
13.(7x—49)=13+169
13.(7x—49)=182
7x—49=182:13
7x—49=14
7x=14+49
7x=63
x=63:7
x=9
13 . (7x - 49) - 169 = 135 : 134
13 . (7x - 49) - 169 = 13
(7x - 49) - 169 = 13:13
(7x - 49) - 169 = 1
7x - 49 = 1 + 169
7x - 49 = 170
7x = 170 - 49
7x = 121
x = 121 : 7
x = ?
\(13.\left(7x-49\right)-169=13^5:13^4\)
\(\Leftrightarrow13.\left(7x-49\right)-169=13^{5-4}\)
\(\Leftrightarrow13.\left(7x-49\right)-169=13\)
\(\Leftrightarrow13.\left(7x-49\right)=13+169\)
\(\Leftrightarrow13.\left(7x-49\right)=182\)
\(\Leftrightarrow7x-49=13:182\)
\(\Leftrightarrow7x-49=\frac{1}{14}\)
\(\Leftrightarrow7x=\frac{1}{14}+49\)
\(\Leftrightarrow7x=\frac{687}{14}\)
\(\Leftrightarrow x=\frac{687}{14}:7\)
\(\Leftrightarrow x=\frac{687}{98}\)
Học tốt #
b/ ( 169-1).( 169-2^2).( 169-3^2)…(169-12^2).(169-13^2)
bài 3 tìm x thuộc N
a. 4.(x-5)-2 mũ 3 = 2 mũ 4.3
b, 4. x mũ 3 + 15 = 271
(2x -3) mũ 2 = 169
Bài 3 :
a) 4.(x-5) - 2 3=24.3
4x-20-8=48
4x=76
x=19
b) 4.x3+15=271
4.x3=256
x3=64
=> x=4
c) ( 2x-3)2= 169
=> 2x-3= 13
2x=16
x=8
Chúc bạn học tốt !
4*(x-5) - 2^3 = 2^4*3
4*(x-5) - 8 = 16*3
4*(x-5) - 8 = 48
4*(x-5) = 48 + 8
4*(x-5) = 56
x- 5 = 56 : 4
x - 5 = 14
x = 14 + 5
x = 19
4*x^3 + 15 = 271
4*x^3 = 271 - 15
4*x^3 = 256
x^3 = 256 : 4
x^3 = 64
x^3 = 4^3
x = 4
tính hợp lý nếu được : a,73+ 169 + 17 + 31
b, 28. 56 - 28 . 46 + 72 .55 - 72.45
c, 181 + 87 : 29 - 7 . 12 + 2 mũ 3 . 5 mũ 2
d, 200 - ( 69 -( 9-2 ) mũ 2 ) . 3 mũ 2
(169-4 mũ 2).(169-5 mũ 2).......(169-13 mũ 2) Giúp mink với nha mn.Thanks
Sửa đề :
( 169-42).(169-52) ....(169-132)
= (169-42).(169-52) ....(169-132)
= (169-42).(169-52) ...(169-169)
= __________________0
= 0
Học tốt !
Tính
E=(169-4^2).(169-5^2).(169-6^2).(169-7^2).(169-8^2).(169-9^20).(169-10^2).(169-11^2).(169-12^2).(169-13^2)