5 x 5 + 5 x 55 = ?
x=44444444444444444444444124
a) x/14 - 1/7 = -3/4
b) x -1/8 =5/8
c) 1/5 + 1/11 < x/55 < 2/5 + 1/55 mà x thuộc z
a) Ta có: \(\dfrac{x}{14}-\dfrac{1}{7}=\dfrac{-3}{4}\)
\(\Leftrightarrow\dfrac{x}{14}=\dfrac{-3}{4}+\dfrac{1}{7}=\dfrac{-21}{28}+\dfrac{4}{28}=\dfrac{-17}{28}\)
hay \(x=\dfrac{-17\cdot14}{28}=\dfrac{-17}{2}\)
Vậy: \(x=-\dfrac{17}{2}\)
\(a)\dfrac{x}{14}-\dfrac{1}{7}=\dfrac{-3}{4}\)
\(\dfrac{x}{14}=\dfrac{-3}{4}+\dfrac{1}{7}\)
\(\dfrac{x}{14}= \dfrac{-17}{28}\)
\(x=\dfrac{14.(-17)}{28}\)
\(x=\dfrac{-17}{2}\)
\(b)x-\dfrac{1}{8}=\dfrac{5}{8}\)
\(x=\dfrac{5}{8}+\dfrac{1}{8}\)
\(x=\dfrac{6}{8}=\dfrac{3}{4}\)
\(c)\dfrac{1}{5}+\dfrac{1}{11}<\dfrac{x}{55}<\dfrac{2}{5}+\dfrac{1}{55}(xthuộc Z )\)
\(\Rightarrow \dfrac{11}{55}+\dfrac{5}{55}<\dfrac{x}{55}<\dfrac{22}{55}+\dfrac{1}{55} \)
\(\Rightarrow \dfrac{16}{55}<\dfrac{x}{55}<\dfrac{23}{55}\)
\(\Rightarrow 21< x < 23\)
\(\Rightarrow x=22\)
22(x+32)-5=55
155-10(x+1)=55
5.22+(x+3)=52
53-5(4+x)=15
a/ 22(x + 32) - 5 = 55 b/ 155 - 10(x+1) = 55
4(x + 32) = 60 10(x + 1) = 100
x + 32 = 60 : 4 x + 1 = 10
x + 32 = 15 x = 10 - 1
x = 15 - 32 x = 9
x = - 17
c/ 5. 22 + (x+3) = 52 53 - 5 (4 + x) = 15
20 + (x+3) = 25 125 - 5(4 +x) = 15
x+ 3 = 5 5(4 + x) = 110
x = 5-3 4 + x= 110 : 2
x = 2 4 + x = 55
x = 51
ủng hộ mk nha !!!! ^_^
tìm x : 5^x + 2* 5^x+1 = 55
1/5+2/11<x/55<2/5+1/55
1/5 + 2/11 < x/55 < 2/5 + 1/55
=> 11/55 + 10/55 < x/55 < 22/55 + 1/55
=> 21/55 < x/55 < 23/55
=> 21 < x < 23
=> x = 22
a)x÷5=5
b)5+x=9
c)66-x=6×6
d)55-x=5×7
a) 25 : 5 = 5
b) 5 + 4 = 9
c) 66 - x = 6x6
66 - x = 36
x = 66 - 36
x = 30
d) 55 - x = 5x7
55 - x = 35
x = 55 - 35
x = 20
a,x:5=5
x=5x5
x=25
b,5+x=9
x=9-5
x=4
c,66-x=6x6
66-x=36
x=66-36
x=30
d,55-x=5x7
55-x=35
x=55-35
x=20
a)x : 5=5
x=5 x 5
x= 25
b)5+x=9
x=9-5
x= 4
c)66-x=6 x 6
66-x= 36
x=66-36
x= 30
d)55-x=5 x 7
55-x= 35
x=55-35
x= 20
mọi người giúp tôi nhé!
9.1:Chọn(C)
9.2:a)4x mũ 3=47-15=32
X mũ 3=32:4=8=2 mũ 3
X=3,..
9.3:Chẳng hạn:5+55:55=6;(55+5):(5+5)=6
Tìm x thuộc Z :
a/1/5+2/11<x/55<2/5+1/55
b/x/21=4/7+(-7)/3
= 11/55+ 10/55<x/55<2/5+1/55
=2/5<x/55<23/55
=22/55<x/55<23/55
=> x thuộc rỗng
x/21=4/7+(-7)/3
= x/21=12/21+(-49)/21
= x/21=-37/21
=> x = -37
Tính bằng cách thuận tiện nhât:
7/5 x 11/24 x 5/7 x 24/55
\(\dfrac{7}{5}\times\dfrac{11}{24}\times\dfrac{5}{7}\times\dfrac{24}{55}\\ =\left(\dfrac{7}{5}\times\dfrac{5}{7}\right)\times\left(\dfrac{11}{24}\times\dfrac{24}{55}\right)\\ =1\times\dfrac{1}{5}\\ =\dfrac{1}{5}\)
\(\dfrac{7x11x5x24}{5x24x7x55}\)=\(\dfrac{11}{55}\)=\(\dfrac{1}{5}\)
= (7/5 x 5/7) x (11/24 x 24/55)
= 1 x 1/5
= 1/5