a) 7,8 : (2x) = \(\frac{1}{4}\): 2\(\frac{2}{3}\)
b) (0,25x) : 3 = \(\frac{5}{6}\) : 0,125
< giải nhanh giúp mik nhé!! >
Tìm x
a) 3,8 :( 2x ) = \(\frac{1}{4}:2\frac{2}{3}\)
b)\(\left(0,25x\right):3=\frac{5}{6}:0,125\)
c)
tìm x
\(a.3.8:\left(2x\right)=\frac{1}{4}:2\frac{2}{3}\)
\(b.\left(0,25x\right):3=\frac{5}{6}:0,125\)
\(c.0,01:2,5=\left(0,75x\right):0,75\)
\(d.1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,1x\right)\)
LÀM GIÚP MIK NHA MẤY BẠN
tìm x trong các tỉ lệ thức sau
\(\left(a\right)3,8:\left(2x\right)=\frac{1}{4}:2\frac{2}{3}\)
\(\left(b\right)\left(0,25x\right):3=\frac{5}{6};0,125\)
\(\left(c\right)0,01:2,5=\left(0,75x\right):0,75\)
\(\left(d\right)1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,1x\right)\)
giải chi tiết nhé aj giải thật chi tiết mk tick cho
a) Lm r nkoa!
b) \(\left(0,25x\right):3=\frac{5}{6}:0,125\)
\(=\left(0,25x\right):3=\frac{20}{3}\)
\(\Rightarrow0,25x=\frac{20}{3}\cdot3=20\)
\(\Rightarrow x=20:0,25=80\)
\(\Rightarrow x=80\)
c) \(0,01:2,5=\left(0,75x\right):0,75\)
\(=\frac{1}{250}=\left(0,75x\right):0,75\)
\(\Rightarrow0,75x=\frac{1}{250}\cdot0,75=\frac{3}{1000}\)
\(\Rightarrow x=\frac{3}{1000}:0,75=\frac{1}{250}\)
\(\Rightarrow x=\frac{1}{250}\)
d) \(1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,1x\right)\)
\(=\frac{5}{3}=\frac{2}{3}:\left(0,1x\right)\)
\(\Rightarrow0,1x=\frac{2}{3}:\frac{5}{3}=\frac{2}{5}\)
\(\Rightarrow x=\frac{2}{5}:0,1=4\)
\(\Rightarrow4\)
Tìm x biết
a. \(3,8:2x=\frac{1}{4}:2\frac{2}{3}\)
b. \(0,25x:3=\frac{5}{6}:0,125\)
c. \(0,01:2,5=0,75x:0,75\)
\(a,3,8:2x=\frac{1}{4}:2\frac{2}{3}\)
\(\Leftrightarrow3,8:2x=\frac{3}{32}\)
\(\Leftrightarrow2x=3,8:\frac{3}{32}\)
\(\Leftrightarrow2x=\frac{608}{15}\)
\(\Leftrightarrow x=\frac{304}{15}\)
\(b,0,25x:3=\frac{5}{6}:0,125\)
\(\Leftrightarrow0,25x:3=\frac{20}{3}\)
\(\Leftrightarrow0,25x=20\)
\(\Leftrightarrow x=80\)
\(c,0,01:2,5=0,75x:0,75\)
\(\Leftrightarrow0,75x:0,75=\frac{1}{250}\)
\(\Leftrightarrow x=\frac{1}{250}\)
Mik lm hơi tắt chỗ nào chw hiểu thì hỏi mik nhé
Tìm x trong các tỉ lệ thức sau :
a) \(3,8:\left(2x\right)=\frac{1}{4}:2\frac{2}{3}\)
b) \(\left(0,25x\right):3=\frac{5}{6}:0,125\)
c) \(0,01:2,5=\left(0,75x\right):0,75\)
d) \(1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,1x\right)\)
làm gấp ạ, đúng mik tick cho
Bài 70 tr 20 sbt ạ
3,8:(2x)=\(\frac{1}{4}\):\(2\frac{2}{3}\)
(0,25x):3=\(\frac{5}{6}\):0,125
0,01:2,5=(0,75x):0,75
\(1\frac{1}{3}\):0,8=\(\frac{2}{3}\):(0,1x)
Tìm x trong các tỉ lệ thức sau :
\(\left(a\right)3,8\div\left(2x\right)=\frac{1}{4}\div2\frac{2}{3}\)
\(3,8\div\left(2x\right)=\frac{3}{32}\)
\(2x=3,8\div\frac{3}{32}\)
\(2x=40\frac{8}{15}\)
\(x=20\frac{4}{15}\)
\(\left(0,25x\right)\div3=\frac{5}{6}\div0,125\)
\(\left(0,25x\right)\div3=6\frac{2}{3}\)
\(\left(0,25x\right)=6\frac{2}{5}\times3\)
\(\left(0,25x\right)=20\)
\(x=80\)
\(0,01\div2,5=\left(0,75x\right)\div0,75\)
\(0,004=\left(0,75x\right)\div0,75\)
\(0,75x=0,75\times0,004\)
\(0,75x=0,003\)
\(x=0,004\)
\(1\frac{1}{3}\div0,8=\frac{2}{3}\div\left(0,1x\right)\)
\(1\frac{2}{3}=\frac{2}{3}\div\left(0,1x\right)\)
\(\left(0,1x\right)=\frac{2}{3}\div1\frac{2}{3}\)
\(\left(0,1x\right)=\frac{2}{5}\)
\(x=4\)
Dung ko z
bạn ghi ra đi mk giải cho (kb để mk ns cho dễ hiểu)
Tìm x trong các tỉ lệ thức:
a,-0,52 : x= -9,36 : 16,38
b,\(\frac{x}{-15}\)=\(\frac{-60}{x}\)
c, \(\frac{-2}{x}\)=\(\frac{-x}{8}\)
d, 3,8 : 2x =\(\frac{1}{4}\): 2\(\frac{2}{3}\)
e, 0,25x : 3 =\(\frac{5}{6}\): 0,125
\(a,-0,52:x=-9,36:16,38\)
\(\Leftrightarrow\frac{-13}{25}:x=\frac{-4}{7}\)
\(\Leftrightarrow x=\frac{-13}{25}:\frac{-4}{7}\)
\(\Leftrightarrow x=\frac{91}{100}\)
\(b,\frac{x}{-15}=\frac{-60}{x}\)
\(\Leftrightarrow x^2=900\)
\(\Leftrightarrow x^2=\left(30,-30\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=30\\x=-30\end{cases}}\)
\(c,\frac{-2}{x}=\frac{-x}{8}\)
\(\Leftrightarrow-\left(x^2\right)=-16\)
\(\Leftrightarrow x^2=16\)
\(\Leftrightarrow x^2=\left(4,-4\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=-4\\x=4\end{cases}}\)
\(d.3,8\div2x=\frac{1}{4}:2\frac{2}{3}\)
\(\Leftrightarrow3,8\div2x=\frac{3}{32}\)
\(\Leftrightarrow2x=3,8\div\frac{3}{32}\)
\(\Leftrightarrow2x=\frac{608}{15}\)
\(\Leftrightarrow x=\frac{608}{15}\div2\)
\(\Leftrightarrow x=\frac{304}{15}\)
\(e.0,25x\div3=\frac{5}{6}:0,125\)
\(\Leftrightarrow0,25x\div3=\frac{20}{3}\)
\(\Leftrightarrow0,25x=\frac{20}{3}.3\)
\(\Leftrightarrow\frac{1}{4}x=20\)
\(\Leftrightarrow x=20:\frac{1}{4}\)
\(\Leftrightarrow x=80\)
bài 2 : Tính giá trị biểu thức sau :
a) \(\frac{6^2.6^3}{3^5}\) b) \(\frac{25^2.4^2}{5^5.\left(-2\right)^5}\) c) \(\frac{\left(0,125\right)^5.\left(2,4\right)^5}{\left(-0,3\right)^5.\left(0,01\right)^3}\) d) \(\left(-2\frac{3}{4}+\frac{1}{2}\right)^2\)
Mình cần rất gấp ạ nên bn nào nhanh mik tick nhé !
a,32
b,\(-\frac{1}{10}\)
c,-1000000
d,\(\frac{9}{16}\)
giúp mik vs mai mik kiểm tra rùi
a) $\frac{x-1}{x}$ - $\frac{1}{x+1}$ = $\frac{2x-1}{x2+x}$
b) (x+2).(5-3x)=0
c)$\frac{5(1-2x)}{3}$ + $\frac{x}{2}$ = $\frac{3(x-5)}{4}$ - 2
d)$(x+2)^{2}$ - (x-1).(x+3) = (2x-4).(x+4)-3
e)$(2x-3)^{2}$ = (2x-3).(x+1)
a:=>x^2-1-x=2x-1
=>x^2-x-1=2x-1
=>x^2-3x=0
=>x=0(loại) hoặc x=3(nhận)
b:=>x+2=0 hoặc 5-3x=0
=>x=-2 hoặc x=5/3
c:=>20(1-2x)+6x=9(x-5)-24
=>20-40x+6x=9x-45-24
=>-34x+20=9x-69
=>-43x=-89
=>x=89/43
d: =>x^2+4x+4-x^2-2x+3=2x^2+8x-4x-16-3
=>2x^2+4x-19=-2x+7
=>2x^2+6x-26=0
=>x^2+3x-13=0
=>\(x=\dfrac{-3\pm\sqrt{61}}{2}\)
e: =>(2x-3)(2x-3-x-1)=0
=>(2x-3)(x-4)=0
=>x=4 hoặc x=3/2