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\(\frac{2}{3}=\frac{2.6}{3.6}=\frac{12}{18}\)
\(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\frac{24}{36}=\frac{24:3}{36:3}=\frac{8}{12}\)
\(\frac{x}{152}=\frac{2}{5}\Rightarrow x.5=2.152\Rightarrow x.5=304\Rightarrow x=304:5=60,8\)
a)\(\frac{2}{3}=\frac{12}{x}\Rightarrow12\times3=2x\)
=>36=2x
=>x=18
b)\(\frac{14}{56}=\frac{1}{4}=\frac{1}{x}\Rightarrow4=x\)
=>x=4
c)\(\frac{24}{36}=\frac{2}{3}=\frac{x}{12}\Rightarrow12\times2=3x\)
=>24=3x
=>x=8
d)\(\frac{x}{152}=\frac{2}{5}\Rightarrow2\times152=5x\)
=>304=5x
=>x=\(\frac{304}{5}\)
\(a)\frac{2}{3}=\frac{12}{x}\)
\(\Rightarrow2\cdot x=12\cdot3\)
\(\Rightarrow2\cdot x=36\)
\(\Rightarrow x=36:2=18\)
Vậy x = 18
\(b)\frac{24}{36}=\frac{x}{12}\)
Rút gọn : \(\frac{24}{36}=\frac{24:12}{36:12}=\frac{2}{3}\)
\(\Rightarrow\frac{2}{3}=\frac{x}{12}\)
\(\Rightarrow2\cdot12=x\cdot3\)
\(\Rightarrow x=\frac{2\cdot12}{3}=8\)
Vậy x = 8
\(c)\frac{14}{56}=\frac{1}{x}\)
Rút gọn : \(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\Rightarrow\frac{1}{4}=\frac{1}{x}\)
\(\Rightarrow x=4\)
Vậy x = 4
\(d)\frac{x}{125}=\frac{2}{5}\)
\(\Rightarrow x\cdot5=2\cdot125\)
\(\Rightarrow x\cdot5=250\)
\(\Rightarrow x=250:5=50\)
Vậy x = 50
Câu 7:
365x103=37595
11890:58=205
Câu 8:
a: =>56x=616
hay x=11
b: =>x=2507x24=60168
Cau 9:
Diện tích là:
\(\left(114-18\right):2\cdot\left(114+18\right):2=3168\left(m^2\right)\)
a, 56 x 12 + 24 x 36 + 24 x36 = 56 x 12 + 12 x 2 x 36 + 12 x 2 x 36
= 56 x 12 + 12 x 72 + 12 x 72
= 12 x ( 56 + 72 + 72 )
= 12 x 200
= 2400
b, 2005 x 178 - 77 x 2005 - 2005 = 2005 x ( 178 - 77 - 1 )
= 2005 x 100
= 200500
**** mình nha nguyễn thùy trang
a, x : 25 = 1205 : 5
x : 25 = 241
x = 241 x 25
x = 6025
b, 2018 – x = 425 +725
2018 – x = 1150
x = 2018 – 1150
x = 868
a) 6X = 3048 : 2
6X = 1524
X = 1524 : 6
X = 254
b) 56 : X = 1326 - 1318
56 : X = 8
X = 56 : 8
X = 8
1.
a, 2/3=12/x
12/18=12/x
=>x=18
Vậy x=18
b, 14/56=1/x
1/4=1/x
=>x=4
Vậy x=4
c, 24/36=x/12
2/3=x/12
8/12=x/12
=>x=8
Vậy x =8
2
38/11+4/17-5/11-3/17
=(38/11-5/11)+(4/17-3/17)
=33/11+1/17
=3+1/17
=51/17+1/17
=52/17
3.
2/7 x =2/3
x=2/3:2/7
x=2/3x7/2
x=7/3
Vậy x=7/3
2/5:x=1/3
x=2/5:1/3
x=2/5x3
x=6/5
Vậy x= 6/5
K cho mình nha bạn !!!!!!!!!!!!^^
a) X x 56 = 308 x 2
X x 56 = 616
x = 616 : 56
x = 11
b) X : 24 = 2507-1205
x : 24 = 1302
x = 1302 x 24
x = 31248
a) X x 56 = 308 x 2
X x 56 = 616
x = 616 : 56
x = 11