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\(5x+7,3=54,7\\ \Rightarrow5x=54,7-7,3\\ \Leftrightarrow5x=47,4\\ \Leftrightarrow x=47,4:5=\dfrac{237}{25}\)
Vậy \(x=\dfrac{237}{25}\)
\(x\times78,3=54+375,36\\ \Leftrightarrow x\times78,3=429,36\\ \Leftrightarrow x=429,36:78,3\\ \Leftrightarrow x=\dfrac{7156}{1305}\)
Vậy \(x=\dfrac{7156}{1305}\)
a) \(7,3\times x+2,3\times x=25,6\times9,6\)
\(\Rightarrow(7,3+2,3)\times x=245,76\)
\(\Rightarrow9,6\times x=245,76\)
=> x = 25,6
b) x : 4,75 = 31,24 - 25,64
=> x : 4,75 = 5,6
=> x = 26,6
c) \(\frac{3}{4}\times x+\frac{1}{2}\times x-15=35 \)
=> \((\frac{3}{4}+\frac{1}{2})\times x=50\)
=> \(\frac{5}{4}\times x=50\)
=> \(x=40\)
d) \(27,5\times\frac{8.4}{x}\times7=21\)
=> \(\frac{8.4}{x}\times7=\frac{42}{55}\)
=> \(\frac{8.4}{x}=\frac{6}{55}\)
=> x = 77
a) 7,3 . x + 2,3. x = 25,6 . 9,6
7,3 . x + 2,3 . x = 245,76
(7,3 + 2,3) . x = 245,76
9,6.x = 245,76
x = 245,76 : 9,6
x = 25,6
b) x : 4,75 = 31,24 - 25,64
x : 4,75 = 5,6
x = 5,6 . 4,75
x = 26,6
28,58 x 6,2 =177.196
56,4 x 2,3 =129.72
13:125=0.104
24,36 : 6 =4.06
nhớ k mình nha ありがとう
\(\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+.......+\dfrac{1}{x\cdot\left(x+1\right)}=\dfrac{122}{123}\)
\(\Leftrightarrow1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+......+\dfrac{1}{x}-\dfrac{1}{x+1}=\dfrac{122}{123}\)
\(\Leftrightarrow1-\dfrac{1}{x+1}=\dfrac{122}{123}\)
\(\Leftrightarrow\dfrac{1}{x+1}=\dfrac{1}{123}\)
\(\Leftrightarrow x=122\)
Bài 2:
a: 5x+7,3=54,7
=>5x=47,4
hay x=9,48
b: 78,2x=54+375,36=429,36
nên x=10734/1955
c: 155,7-x=2,3x5
=>155,7-x=11,5
hay x=144,2