Giải biểu thức sau:
(1/7+1/91+1/24+1/475).25/24.x+30%=1/2
(1/6+1/66+1/176+1/336+1/546).26/25.x+30%=1/2
Những câu hỏi liên quan
Tìm x€ Z:(1/24*25+1/25*26+...+1/29*30)*120+x:1/3=-5
\(D=\frac{1}{6}+\frac{1}{66}+\frac{1}{176}+\frac{1}{336}+\frac{1}{546}\)
\(x+\frac{5}{3}=\frac{1}{81}\)
\(-52+\frac{2}{3}x=-46\)
\(\frac{x}{45}=\frac{5}{6}+\frac{-29}{30}\)
\(D=\frac{1}{6}+\frac{1}{66}+\frac{1}{176}+\frac{1}{336}+\frac{1}{546}\)
\(D=\frac{1}{1.6}+\frac{1}{6.11}+\frac{1}{11.16}+\frac{1}{16.21}+\frac{1}{21.26}\)
\(D=\frac{1}{5}\left(\frac{5}{1.6}+\frac{5}{6.11}+\frac{5}{11.16}+\frac{5}{16.21}+\frac{5}{21.26}\right)\)
\(D=\frac{1}{5}\left(\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+...+\frac{1}{21}-\frac{1}{26}\right)\)
\(D=\frac{1}{5}\left(\frac{1}{1}-\frac{1}{26}\right)\)
\(D=\frac{1}{5}.\frac{25}{26}=\frac{5}{26}\)
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\(x+\frac{5}{3}=\frac{1}{81}\)
\(x=\frac{1}{81}-\frac{5}{3}\)
\(x=\frac{-134}{81}\)
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\(x+\frac{5}{3}=\frac{1}{81}\)
\(\Leftrightarrow x=\frac{1}{81}-\frac{5}{3}\)
\(\Leftrightarrow x=-\frac{134}{81}\)
\(-52+\frac{2}{3}x=-46\)
\(\Leftrightarrow\frac{2}{3}x=-46+52\)
\(\Leftrightarrow\frac{2}{3}x=6\)
<=> 2x = 6.3
<=> 2x = 18
=> x = 9
\(\frac{x}{45}=\frac{5}{6}+\frac{-29}{30}\)
(có thể hơi khó hiểu từ bước 2, bạn lấy mẫu số chung là 30 nhé)
\(\Leftrightarrow\frac{x}{45}=\frac{25}{30}-\frac{29}{30}\)
\(\Leftrightarrow\frac{x}{45}=\frac{25-29}{30}\)
\(\Leftrightarrow\frac{x}{45}=\frac{-4}{30}\)
\(\Leftrightarrow\frac{x}{45}=\frac{-2}{15}\)
\(\Leftrightarrow x=45\left(-\frac{2}{15}\right)\)
=> x = -6
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Xem thêm câu trả lời
( 1/24 x 25 + 1/25 x 26 + ... + 1/29 x 30 ) x 150 + 103/100 [ 103/100 x ( X - 1 ) ] = 22
1
a)X*3/5=2/3
b)3/8-1/6*x=1/4
c)1/2+1/2:x=1
d ( 1/8+1/24+1/48+1/80+1/120)*(x-1/2)=25/26
e ) (x-5)*30/100=20/100*x+5
a) x . 3/5 = 2/3
<=> x = 2/3 : 3/5
<=> x = 2/3 . 5/3
<=> x = 10/9
Học tốt nha! :)
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25^28+25^24+25^20+...+25^4+1/25^30+25^28+25^26+...+25^2+1
tìm x biết :
x*2/25=1/7+1/91+1/247+1/475
cho mk cảm ơn bạn giải ra hộ mk nha !
\(\)\(x×\frac{2}{5}=\frac{1}{7}+\frac{1}{91}+\frac{1}{247}+\frac{1}{475}\)
\(x×\frac{2}{5}=\frac{4}{25}\)
\(x=\frac{4}{25}:\frac{2}{5}\)
\(x=\frac{2}{5}\)
vậy \(x=\frac{2}{5}\)
nhầm
\(x×\frac{2}{25}=\frac{1}{7}+\frac{1}{91}+\frac{1}{247}+\frac{1}{475}\)
\(x×\frac{2}{25}=\frac{4}{25}\)
\(x=\frac{4}{25}:\frac{2}{25}\)
\(x=2\)
vậy \(x=2\)
Xem thêm câu trả lời
a) Tính B=(2/5.4-1)(2/5.6-1)(2/6.7-1)(2/7.8-1)(2/8.9-1)(2/9.10-1)
b) tính tổng 100 số hạn đầu tiên của giãy:
1/6+1/66+1/176+1/336+1/546+...
1,Tính giá trị biểu thức
a, 13 . 17 - 256 : 16 + 14 : 7 - 1
b, 15 . 24 - 14 . 5 . (145 : 5 - 27)
c, 15 . 8 - (17 - 30 + 83) - 144 : 6
d,18 - 4 . (27 - 90 + 73) : 10
2,Tìm x
a, 315 - (135 - x)=215
b, x - 320 : 32 = 25 . 16
c, 3 . x - 2018 : 2 = 23
d, 280 - 9 . x - x = 80
e, 38 . x - 12 . x - x . 16 = 40
Giúp mình với nhé,mình đang cần gấp !!
2,
a) \(315-\left(135-x\right)=215\)
\(\Rightarrow135-x=315-215\)
\(\Rightarrow135-x=100\)
\(\Rightarrow x=135-100\)
\(\Rightarrow x=35\)
b) \(x-320:32=25\cdot16\)
\(\Rightarrow x-10=5^2\cdot4^2\)
\(\Rightarrow x-10=20^2\)
\(\Rightarrow x-10=400\)
\(\Rightarrow x=410\)
c) \(3\cdot x-2018:2=23\)
\(=3\cdot x-1009=23\)
\(\Rightarrow3\cdot x=1032\)
\(\Rightarrow x=1032:3\)
\(\Rightarrow x=344\)
d) \(280-9\cdot x-x=80\)
\(\Rightarrow280-x\cdot\left(9+1\right)=80\)
\(\Rightarrow280-10\cdot x=80\)
\(\Rightarrow10\cdot x=280-80\)
\(\Rightarrow10\cdot x=200\)
\(\Rightarrow x=20\)
e) \(38\cdot x-12\cdot x-x\cdot16=40\)
\(\Rightarrow x\cdot\left(38-12-16\right)=40\)
\(\Rightarrow x\cdot10=40\)
\(\Rightarrow x=40:10\)
\(\Rightarrow x=4\)
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Bài 2: Viết tiếp 2 số hạng vào dãy số sau:
a) 10, 13, 18, 26, ...
b) 0, 1, 2, 4, 7, 12, ...
c) 0, 1, 4, 9, 18, ...
d) 5, 6, 8, 10, ...
e) 1, 6, 54, 648, ... ...
k) 1, 3, 3, 9, 27,
L) 1, 2, 3, 6, 12, 24....
m) 1, 4, 9, 16, 25, 36,
o) 2, 12, 30, 56, 90,
p) 1, 3, 9, 27, ....
g) 1, 5, 14, 33, 72, h) 2, 20, 56, 110, 182.....
q) 2, 6, 12, 20, 30, ...
t) 6, 24, 60, 120, 210...
a) 10; 13; 18; 26; 36; 52...
c) 0; 1; 4; 9; 16; 25...
m) 1; 4; 9; 16; 25; 36; 49; 64...
p) 1; 3; 9; 27; 81; 243...
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