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Bài 1:
a; (\(\dfrac{1}{4}\)\(x\) - \(\dfrac{1}{8}\)) x \(\dfrac{3}{4}\) = \(\dfrac{1}{4}\)
\(\dfrac{1}{4}x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{4}\) : \(\dfrac{3}{4}\)
\(\dfrac{1}{4}\)\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{4}\) x \(\dfrac{4}{3}\)
\(\dfrac{1}{4}x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{3}\)
\(\dfrac{1}{4}x\) = \(\dfrac{1}{3}\) + \(\dfrac{1}{8}\)
\(\dfrac{1}{4}\) \(x\)= \(\dfrac{8}{24}\) + \(\dfrac{11}{24}\)
\(\dfrac{1}{4}x=\dfrac{11}{24}\)
\(x=\dfrac{11}{24}:\dfrac{1}{4}\)
\(x=\dfrac{11}{24}\times4\)
\(x=\dfrac{11}{6}\)
b; \(\dfrac{12}{5}:x\) = \(\dfrac{14}{3}\) x \(\dfrac{4}{7}\)
\(\dfrac{12}{5}\) : \(x\) = \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{12}{5}\) : \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{12}{5}\) x \(\dfrac{3}{8}\)
\(x\) = \(\dfrac{9}{10}\)
a) 32 : (3.x - 2) = 8
3x - 2 = 32 : 8
3x - 2 = 4
3x = 4 + 2
3x = 6
x = 6 : 3
x = 2
b) 75 : (x - 18) = 25
x - 18 = 75 : 25
x - 18 = 3
x = 3 + 18
x = 21
c) (15 - 6.x) . 243 = 729
15 - 6x = 729 : 243
15 - 6x = 3
6x = 15 - 3
6x = 12
x = 12 : 6
x = 2
d) 4.(x - 12) + 9 = 17
4(x - 12) = 17 - 9
4(x - 12) = 8
x - 12 = 8 : 4
x - 12 = 2
x = 2 + 12
x = 14
e) 20 - 2.(x + 4) = 4
2(x + 4) = 20 - 4
2(x + 4) = 16
x + 4 = 16 : 2
x + 4 = 8
x = 8 : 2
x = 4
`32: ( 3xx x -2)=8`
`3xx x-2=32:8`
`3xx x-2=4`
`3 xx x=4+2`
`3xx x=6`
`x=6:3`
`x=2`
__
`75 : (x-18) =25`
`x-18=75:25`
`x-18= 3`
`x=3+18`
`x=21`
__
`(15-6 xx x ) xx 243 =729`
`15-6 xx x = 729 : 243`
`15-6 xx x = 3`
`6 xx x=15-3`
`6 xx x=12`
`x=12:6`
`x=2`
__
`4 xx (x-12)+9=17`
`4 xx (x-12)=17-9`
`4 xx (x-12)= 8`
`x-12=8:4`
`x-12=2`
`x=2+12`
`x=14`
__
`20-2xx(x+4)=4`
`2xx(x+4)=20-4`
`2xx(x+4)=16`
`x+4=16:2`
`x+4=8`
`x=8-4`
`x=4`
Tìm X:
3,5 x X + 1,54 x 3,5 =15
20 + 12 : ( X - 2019 ) =32
Tính nhanh:
3/7 x 4/13 +3/7 x 9/13 + 5 và 4/7
1)\(3,5\cdot x+1,54\cdot3,5=15\)
\(3,5\left(x+1,54\right)=15\)
\(x+1,54=\frac{15}{3,5}\)
\(x+1,54=\frac{30}{7}\)
\(x=\frac{30}{7}-1,54\)
\(x=\frac{30}{7}-\frac{77}{50}\)
\(x=\frac{961}{350}\)
\(20+\frac{12}{x-2019}=32\)
\(\frac{12}{x-2019}=32-20\)
\(\frac{12}{x-2019}=12\)
\(x-2019=\frac{12}{12}\)
\(x-2019=1\)
\(x=1+2019\)
2)
\(\frac{3}{7}\cdot\frac{4}{13}+\frac{3}{7}\cdot\frac{9}{13}+5\frac{4}{7}\)
\(=\frac{3}{7}\cdot\frac{4}{13}+\frac{3}{7}\cdot\frac{9}{13}+13\cdot\frac{3}{7}\)
\(=\frac{3}{7}\left(\frac{4}{13}+\frac{9}{13}+13\right)\)
\(=\frac{3}{7}\cdot14\)
\(=6\)
3.5*(x-1.54)=15
x+1.54=15;3.5
x+1.54=4.28
x=4.28-1.54
x=2.74
chưa suy nghĩ
\(\frac{4}{5}\times\left(20-x\right)=4\)
\(20-x=4:\frac{4}{5}\)
\(20-x=5\) Mình Chúc Các Bn Học Giỏi !!!!!!!!!!!!!!!!!!!
\(x=20-5\)
\(x=15\)
(1/2+1/6+1/12+1/20) x (20 - x) =4
4/5 x (20-x)= 4
20-x=4:4/5
20-x=5
x=15
\(\frac{x}{20}=\frac{12}{15}\)
Ta có : \(x.15=20.12\)
\(\Rightarrow x.15=240\)
\(x=240:15=16\)
\(\frac{x}{4}=\frac{9}{x}\)
Ta có : \(x.x=4.9\)
\(\Rightarrow x.x=36\)
\(\Rightarrow x=6\)
1. \(\frac{x}{20}=\frac{12}{15}\)\(=>15x=12.20=>15x=240=>x=16\)
2.\(\frac{x}{4}=\frac{9}{x}\)\(=>x^2=9.4=>x^2=36\)\(=>x=\orbr{\begin{cases}6\\-6\end{cases}}\)