1) Tìm x
a) 4,5 : 0,3 = 2,25 : (0,1 . x)
b) 8 : \(\left(\frac{1}{4}.x\right)\) = 2 : 0,02
c) 3 : \(2\frac{1}{4}\) = \(\frac{3}{4}\) : (6 . x)
Tìm x trong các tỉ lệ thức sau:
a) \(\left(\frac{1}{3}.x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
b) 4,5 : 0,3 = 2,25 : (0,1 .x)
c) 8 : \(\left(\frac{1}{4}.x\right)=2:0,02\)
d) 3 : \(2\frac{1}{4}=\frac{3}{4}:\left(6.x\right)\)
\(\frac{1}{3}x:\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
\(\Rightarrow\frac{1}{3}x:\frac{2}{3}=\frac{35}{8}\)
\(\Rightarrow\frac{1}{3}x=\frac{35}{12}\)
\(\Rightarrow x=\frac{35}{4}\)
a) \(\left(\frac{1}{3}\cdot x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
\(=\left(\frac{1}{3}\cdot x\right):\frac{2}{3}=\frac{35}{8}\)
\(\Rightarrow\frac{1}{3}\cdot x=\frac{35}{8}\cdot\frac{2}{3}\)
\(\Rightarrow x=\frac{35}{12}:\frac{1}{3}=\frac{35}{4}\)
b) \(4,5:0,3=2,5:\left(0,1\cdot x\right)\)
\(=15=2,5:\left(0,1\cdot x\right)\)
\(\Rightarrow0,1\cdot x=2,25:15\)
\(\Rightarrow x=\frac{3}{20}:0,1=\frac{3}{2}=1,5\)
c) \(8:\left(\frac{1}{4}\cdot x\right)=2:0,02\)
\(8:\left(\frac{1}{4}\cdot x\right)=100\)
\(\Rightarrow\frac{1}{4}\cdot x=8:100\)
\(\Rightarrow x=\frac{2}{25}:\frac{1}{4}=\frac{8}{25}=0,32\)
d) \(3:2\frac{1}{4}=\frac{3}{4}:\left(6\cdot x\right)\)
\(=\frac{4}{3}=\frac{3}{4}:\left(6:x\right)\)
\(\Rightarrow6\cdot x=\frac{3}{4}:\frac{4}{3}\)
\(\Rightarrow x=\frac{9}{16}:6=\frac{3}{32}=0,09375\)
Tìm x trong các tỉ lệ thức sau:
a) \(\left(\frac{1}{3}.x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
b) 4,5 : 0,3 = 2,25 : ( 0,1 .x)
c) \(8:\left(\frac{1}{4}.x\right)=2 :0,02\)
d) \(3:2\frac{1}{4}=\frac{3}{4}:\left(6.x\right)\)
Tim x trong cac ti le thuc sau
a) \(\left(\frac{1}{3}.x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
b)\(4,5:0,3=2,25:\left(0,1.x\right)\)
c)\(8:\left(\frac{1}{4}.x\right)=2:0.02\)
d)\(3:2\frac{1}{4}=\frac{3}{4}:\left(6.x\right)\)
a)\(\left(\frac{1}{3}.x\right):\frac{2}{3}=\frac{7}{4}.\frac{5}{2}\)
\(\left(\frac{1}{3}.x\right):\frac{2}{3}=\frac{35}{8}\)
\(\frac{1}{3}.x=\frac{35}{8}.\frac{2}{3}\)
\(\frac{1}{3}.x=\frac{35}{12}\)
\(x=\frac{35}{12}:\frac{1}{3}\)
\(x=\frac{35}{12}.\frac{3}{1}\)
\(x=\frac{35}{4}\)
b)\(\frac{4,5}{0,3}=\frac{2,25}{0,1.x}\)
\(4,5.\left(0,1.x\right)=2,25.0,3\)
\(4,5.\left(0,1.x\right)=0,675\)
\(0,1.x=0,675:4,5\)
\(0,1.x=0,15\)
\(x=0,15:0,1\)
\(x=1.5\)
c)\(\frac{8}{\frac{1}{4}.x}=\frac{2}{0,02}\)
\(\left(\frac{1}{4}.x\right).2=8.0,02\)
\(\left(\frac{1}{4}.x\right).2=0,16\)
\(\frac{1}{4}.x=0,16:2\)
\(\frac{1}{4}.x=0,08\)
\(x=0,08:\frac{1}{4}\)
\(x=0,32\)
d)\(\frac{3}{\frac{9}{4}}=\frac{\frac{3}{4}}{6.x}\)
\(3.\left(6.x\right)=\frac{3}{4}.\frac{9}{4}\)
\(3.\left(6.x\right)=\frac{27}{16}\)
\(6.x=\frac{27}{16}:3\)
\(6.x=\frac{9}{16}\)
\(x=\frac{9}{16}:6\)
\(x=\frac{3}{32}\)
HỌC TỐT ^^
1. tìm x trong các tỉ lệ thức sau:
a. \(\left(\frac{1}{3}.x\right):\frac{2}{3}=1\frac{3}{4}:2\)
b. 4,5:0,3 = 2,25:(0,1.x)
c. 8:\(\left(\frac{1}{4}.x\right)=2:0,02\)
c. \(3:2\frac{1}{4}=\frac{3}{4}:\left(6:x\right)\)
2. tìm hai số x,y,z biết rằng
\(\frac{x}{2}=\frac{y}{3},\frac{y}{4}=\frac{z}{5}\) và x+y-z=10
a)\(\left(\frac{1}{3}.x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
b)\(4,5:0,3=2,25:\left(0,1.x\right)\)
c)\(8:\left(\frac{1}{4}.x\right)=2:0,02\)
d) \(3:2\frac{1}{4}=\frac{2}{3}:\left(6.x\right)\)
tìm x biết:
a,\(\left(\frac{1}{3}.x\right):\frac{2}{3}=1\frac{2}{3}:\frac{2}{5}\)
b,\(4,5:0,3=2,25:\left(0,1.x\right)\)
c,\(8:\left(\frac{1}{4}.x\right)=2:0,02\)
d,\(3:2\frac{1}{4}=\frac{3}{4}:\left(6.x\right)\)
e,\(3,8:\left(2.x\right)=\frac{1}{4}:2\frac{2}{3}\)
f,\(\left(0,25.x\right):3=\frac{5}{6}:0,125\)
g,\(1\frac{1}{3}:0,8=\frac{2}{3}:\left(0.1.x\right)\)
làm 1 bài mẫu nha
a) \(\left(\frac{1}{3}.x\right):\frac{2}{3}=\frac{25}{6}\)
\(\Rightarrow\frac{1}{3}x=\frac{25}{9}\)
\(\Rightarrow x=\frac{25}{9}:\frac{1}{3}\)
\(\Rightarrow x=\frac{25}{3}\)
các bài sau dễ lắm
a) \(\left(\frac{1}{3}x\right):\frac{2}{3}=1\frac{2}{3}:\frac{2}{5}\)
\(\Rightarrow\frac{1}{3}x:\frac{2}{3}=\frac{25}{6}\)
\(\Rightarrow\frac{1}{3}x=\frac{5}{3}\)
\(\Rightarrow x=\frac{5}{3}:\frac{1}{3}\)
\(\Rightarrow x=5\)
a) \(\left(\frac{1}{3}\cdot x\right):\frac{2}{3}=1\frac{2}{3}:\frac{2}{5}\)
\(\left(\frac{1}{3}\cdot x\right):\frac{2}{3}=\frac{25}{6}\)
\(\frac{1}{3}x=\frac{25}{6}\cdot\frac{2}{3}\)
\(\frac{1}{3}x=\frac{25}{9}\)
\(x=\frac{25}{9}:\frac{1}{3}\)
\(x=\frac{25}{3}\)
b) \(4,5:0,3=2,25:\left(0,1x\right)\)
\(15=2,25:\left(0,1x\right)\)
\(2,25:15=0,1x\)
\(0,15=0,1x\)
\(0,15:0,1=x\)
\(1,5=x\)
c) \(8:\left(\frac{1}{4}\cdot x\right)=2:0,02\)
\(8:\left(\frac{1}{4}\cdot x\right)=100\)
\(\frac{1}{4}\cdot x=8:100\)
\(\frac{1}{4}\cdot x=0,08\)
\(x=0,08:\frac{1}{4}\)
\(x=0,32\)
d) \(3:2\frac{1}{4}=\frac{3}{4}:\left(6\cdot x\right)\)
\(\frac{4}{3}=\frac{3}{4}:\left(6\cdot x\right)\)
\(\frac{3}{4}:\frac{4}{3}=6\cdot x\)
\(\frac{9}{16}=6\cdot x\)
\(\frac{9}{16}:6=x\)
\(\frac{3}{32}=x\)
e) \(3,8:\left(2\cdot x\right)=\frac{1}{4}:2\frac{2}{3}\)
\(3,8:\left(2\cdot x\right)=\frac{3}{32}\)
\(2\cdot x=3,8:\frac{3}{32}\)
\(2\cdot x=\frac{608}{15}\)
\(x=\frac{608}{15}:2\)
\(x=\frac{304}{15}\)
f) \(\left(0,25\cdot x\right):3=\frac{5}{6}:0,125\)
\(\left(0,25\cdot x\right):3=\frac{20}{3}\)
\(0,25\cdot x=\frac{20}{3}\cdot3\)
\(0,25\cdot x=20\)
\(x=20:0,25\)
\(x=80\)
g) \(1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,1\cdot x\right)\)
\(\frac{5}{3}=\frac{2}{3}:\left(0,1\cdot x\right)\)
\(\frac{2}{3}:\frac{5}{3}=0,1\cdot x\)
\(\frac{2}{5}=0,1x\)
\(\frac{2}{5}:0,1=x\)
\(4=x\)
(Nhớ thử lại kết quả nhé)
tìm x trong các tỉ lệ thữ sau:
a) \(\left(\frac{1}{3}\times x\right)\) : \(\frac{2}{3}=1\frac{3}{4}\) : \(\frac{2}{5}\)
b) 4,5 : 0,3 = 2,25 : ( 0,1 . x )
c) 8 : \(\left(\frac{1}{4}\times x\right)\) = 2 : 0,02
d) 3 : \(2\frac{1}{4}\) = \(\frac{3}{4}\) : ( 6 . x )
a. => (1/3.x):2/3=7/4:2/5
=> 1/3.x=(7/4.2/3):2/5
=> 1/3.x=7/6.5/2
=> 1/3.x=35/12
=> x=35/12:1/3
=> x=35/12.3
=> x=35/4
b. => 4,5.(0,1.x)=0,3.2,25
=> 4,5.(0,1.x)=0,675
=> 0,1.x=0,675:4,5
=> 0,1.x=0,15
=> x=0,15:0,1
=> x=1,5
c. => 2.(1/4.x)=8.0,02
=> 1/2.x=0,16
=> x=0,16:1/2
=> x=0,16.2
=> x=0,32
d. => 3:9/4=3/4:(6.x)
=> 3.(6.x)=9/4.3/4
=> 18.x=27/16
=> x=27/16:18
=> x=27/16.1/18
=> x=3/32
a) ( 1/3 . x ) : 2/3 = 7/4 : 2/5
1/3 . x : 2/3 = 35/8
1/3 . x = 35/8 . 2/3
1/3 . x = 35/12
x = 35/12 : 1/3
x = 35/4
a) \(\left(\dfrac{1}{3}.x\right):\dfrac{2}{3}=1\dfrac{3}{4}:\dfrac{2}{5}\)
b) 4,5 : 0,3 = 2,25 (0,1. x)
c) \(8:\left(\dfrac{1}{4}.x\right)=2:0,02\)
d) \(3:2\dfrac{1}{4}=\dfrac{3}{4}:\left(6.x\right)\)
Giải:
a) \(\left(\dfrac{1}{3}.x\right):\dfrac{2}{3}=1\dfrac{3}{4}:\dfrac{2}{5}\)
\(\Leftrightarrow\left(\dfrac{1}{3}x\right):\dfrac{2}{3}=\dfrac{7}{4}:\dfrac{2}{5}\)
\(\Leftrightarrow\left(\dfrac{1}{3}x\right):\dfrac{2}{3}=\dfrac{35}{8}\)
\(\Leftrightarrow\dfrac{1}{3}x=\dfrac{35}{8}.\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{1}{3}x=\dfrac{35}{12}\)
\(\Leftrightarrow x=\dfrac{35}{12}:\dfrac{1}{3}\)
\(\Leftrightarrow x=\dfrac{35}{4}\)
Vậy \(x=\dfrac{35}{4}\).
b) \(4,5:0,3=2,25\left(0,1.x\right)\)
\(\Leftrightarrow15=2,25\left(0,1.x\right)\)
\(\Leftrightarrow2,25\left(0,1.x\right)=15\)
\(\Leftrightarrow0,1.x=\dfrac{15}{2,25}\)
\(\Leftrightarrow0,1.x=\dfrac{20}{3}\)
\(\Leftrightarrow x=\dfrac{20}{3}:0,1\)
\(\Leftrightarrow x=\dfrac{200}{3}\)
Vậy \(x=\dfrac{200}{3}\).
c) \(8:\left(\dfrac{1}{4}.x\right)=2:0,02\)
\(\Leftrightarrow8:\left(\dfrac{1}{4}.x\right)=100\)
\(\Leftrightarrow\dfrac{1}{4}.x=\dfrac{2}{25}\)
\(\Leftrightarrow x=\dfrac{2}{25}:\dfrac{1}{4}\)
\(\Leftrightarrow x=\dfrac{8}{25}\)
Vậy \(x=\dfrac{8}{25}\).
d) \(3:2\dfrac{1}{4}=\dfrac{3}{4}:\left(6.x\right)\)
\(\Leftrightarrow3:\dfrac{9}{4}=\dfrac{3}{4}:\left(6.x\right)\)
\(\Leftrightarrow\dfrac{4}{3}=\dfrac{3}{4}:\left(6.x\right)\)
\(\Leftrightarrow\dfrac{4}{3}:\left(6.x\right)=\dfrac{3}{4}\)
\(\Leftrightarrow6.x=\dfrac{4}{3}:\dfrac{3}{4}\)
\(\Leftrightarrow6.x=\dfrac{16}{9}\)
\(\Leftrightarrow x=\dfrac{16}{9}:6\)
\(\Leftrightarrow x=\dfrac{8}{27}\)
Vậy \(x=\dfrac{8}{27}\).
Chúc bạn học tốt!!!
1tim x
a .(\(\frac{1}{3}\). x ) :\(\frac{2}{3}\) =\(1\frac{3}{4}\):\(\frac{2}{5}\)
b. 4,5 :0,3 = 2,25 : (0,1 . x )
c. 8 : (\(\frac{1}{4}\). x ) = 2 :0,02
d. 3 :\(2\frac{1}{4}\)= \(\frac{3}{4}\) : (6x )
a. \(\left(\frac{1}{3}x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
\(\left(\frac{1}{3}x\right):\frac{2}{3}=\frac{35}{8}\)
\(\frac{1}{3}x=\frac{35}{8}.\frac{2}{3}=\frac{35}{12}\)
\(x=\frac{35}{12}.3=\frac{35}{4}\)
b) 4,5:0,3=2,25:(0,1.x)
\(\frac{45}{10}:\frac{10}{3}=\frac{225}{100}:\left(\frac{1}{10}x\right)\)
\(15=\frac{9}{4}:\left(\frac{1}{10}x\right)\)
\(\frac{9}{4}:\left(\frac{1}{10}x\right)=15\)
\(\frac{1}{10}x=\frac{9}{4}.\frac{1}{15}=\frac{3}{20}\)
\(x=\frac{3}{20}.10=\frac{3}{2}\)
c) 8:\(\left(\frac{1}{4}x\right)=2:0,02\)
8:\(\left(\frac{1}{4}x\right)\)=2:\(\frac{2}{100}\)
8:\(\left(\frac{1}{4}x\right)=2.\frac{100}{2}=100\)
\(\frac{1}{4}x=\frac{8}{100}\)
\(x=\frac{8}{100}.4=\frac{8}{25}\)
d)\(3:2\frac{1}{4}=\frac{3}{4}:\left(6x\right)\)
\(3.\frac{9}{4}=\frac{3}{4}:\left(6x\right)\)
\(\frac{3}{4}:\left(6x\right)=\frac{27}{4}\)
\(6x=\frac{3}{4}.\frac{4}{27}=\frac{1}{9}\)
\(x=\frac{1}{9}.\frac{1}{6}=\frac{1}{54}\)
a.=> 1/2 . x = 35/8
=> x = 31/8
b. => 15 = 22,5 . x
=> x = 2/3
c. => 32 . x = 100
=>x=25/8
d. 4/3= 1/8 . x
x = 32/3