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: x = 1,2
a: 1,995:x=7,98
nên x=0,25
c: 120,4+x=268,26-13
=>x+120,4=255,26
hay x=134,86
a: 1,995:x=7,98
=> x=0,25
câu b ko nhìn thấy rõ đề
c: 120,4+x=268,26-13
=>x+120,4=255,26
=> x=134,86
B3:
a) x = 0
b) 9
B4 :
a) x = 1,2,3
b) x = 0,1,2
B5:
0,21; 0,215; 0,22
a: \(x+\dfrac{3}{9}=\dfrac{7}{6}\cdot\dfrac{2}{3}\)
=>\(x+\dfrac{1}{3}=\dfrac{14}{18}=\dfrac{7}{9}\)
=>\(x=\dfrac{7}{9}-\dfrac{1}{3}=\dfrac{7}{9}-\dfrac{3}{9}=\dfrac{4}{9}\)
b: \(x-\dfrac{2}{3}=\dfrac{1}{8}:\dfrac{5}{4}\)
=>\(x-\dfrac{2}{3}=\dfrac{1}{8}\cdot\dfrac{4}{5}=\dfrac{1}{10}\)
=>\(x=\dfrac{1}{10}+\dfrac{2}{3}=\dfrac{3+20}{30}=\dfrac{23}{30}\)
`#3107.101107`
a)
\(x+x+\dfrac{1}{2}\times\dfrac{2}{5}+x+\dfrac{8}{10}=121\\3x+\dfrac{1}{5}+\dfrac{4}{5}=121\\ 3x+1=121\\ 3x=121-1\\ 3x=120\\ x=40 \)
Vậy, `x = 40`
b)
\(\dfrac{12+x}{42}=\dfrac{5}{6}\\ \dfrac{12+x}{42}=\dfrac{35}{42}\\ \dfrac{12+x}{42}-\dfrac{35}{42}=0\\ \dfrac{12+x-35}{42}=0\\ \dfrac{x-\left(35-12\right)}{42}=0\\ \dfrac{x-23}{42}=0\\ x-23=0\\ x=23\)
Vậy,` x = 23.`
a: \(x+x+\dfrac{1}{2}\cdot\dfrac{2}{5}+x+\dfrac{8}{10}=121\)
=>\(3x+\dfrac{1}{5}+\dfrac{4}{5}=121\)
=>3x+1=121
=>3x=120
=>x=40
b: \(\dfrac{x+12}{42}=\dfrac{5}{6}\)
=>\(x+12=42\cdot\dfrac{5}{6}=35\)
=>x=35-12=23
\(a,x-21,7=34,08\\ \Rightarrow x=34,08+21,7\\ \Rightarrow x=55,78\\ b,x+4,08=9,5\\ \Rightarrow x=9,5-4,08\\ \Rightarrow x=5,42\\ c,x\times3,6=84,24\\ \Rightarrow x=84,24:3,6\\ \Rightarrow x=23,4\\ d,x:1,8=3,06\\ \Rightarrow x=3,06\times1,8\\ \Rightarrow x=5,508\)
a,x−21,7=34,08⇒x=34,08+21,7⇒x=55,78b,x+4,08=9,5⇒x=9,5−4,08⇒x=5,42c,x×3,6=84,24⇒x=84,24:3,6⇒x=23,4d,x:1,8=3,06⇒x=3,06×1,8⇒x=5,508
Bài 1:
a: x/33=4
nên x=4x33=132
b: 5/x=1/2
=>5/x=5/10
hay x=10
Bài 2:
Gọi tử là x
Mẫu là 180-x
Theo đề, ta có: \(\dfrac{x}{180-x}=\dfrac{4}{5}\)
=>5x=720-4x
=>9x=720
hay x=80
Vậy: Phân số cần tìm là 80/100
a, x + 15,96 = 17,485
x = 17,485 - 15,96 = 1,525
b, 99,99 - x = 5, 678
x = 99,99 - 5,678 = 94,312
c, x = 105,85 : 5 = 21,17
d, x = 9,8 x 8,9 = 87,22
e, x = 76,32 : 36 = 2,12
Bài 2: Tìm x, biết:
a) x + 15,96 = 1,345 x 13
x + 15,96 = 17,485
x = 17,485 - 15,96
x = 1.525
b) 99,99 – x = 5,678
x = 99,99 – 5,678
x = 94.312
c) x x 5 = 105,85
x = 105,85 : 5
x = 21.17
d) x : 8,9 = 9,8
x = 9,8 x 8,9
x = 87.22
e) 76,32 : x = 36
x = 76,32 : 36
x = 2.12