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\(\dfrac{2}{49}\) x 121 : \(\dfrac{22}{7}\)
= \(\dfrac{2}{49}\) x 121 x \(\dfrac{7}{22}\)
= \(\dfrac{2}{7\times7}\) \(\times\)\(\dfrac{11\times11\times7}{11\times2}\)
= \(\dfrac{11}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{7}+y\times\frac{1}{2}=\frac{8}{7}:\frac{3}{2}\)
=> \(\frac{5}{7}+y\times\frac{1}{2}=\frac{8}{7}\times\frac{2}{3}\)
=> \(\frac{5}{7}+y\times\frac{1}{2}=\frac{16}{21}\)
=> \(y\times\frac{1}{2}=\frac{16}{21}-\frac{5}{7}=\frac{1}{21}\)
=> \(y=\frac{1}{21}:\frac{1}{2}=\frac{1}{21}\cdot2=\frac{2}{21}\)
5/7 + Y x 1/2 = 8/7 : 3/2
=> 5/7 + Y x 1/2 = 16/21
=> Y x 1/2 = 16/21 - 5/7
=> Y x 1/2 = 1/21
=> Y = 1/21 : 1/2
=> Y = 2/21
Hok tốt ^^
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\(x+x:0,25+x.2+x:0,125=0,45\)
\(\Leftrightarrow x+x:\dfrac{1}{4}+x.2+x:\dfrac{1}{8}=0,45\)
\(\Leftrightarrow x+x.4+x.2+x.8=0,45\)
\(\Leftrightarrow x\left(1+4+2+8\right)=0,45\)
\(\Leftrightarrow x.15=0,45\)
\(\Leftrightarrow x=0,03\)
X + X : 0.25 + X x 2 + X : 0.125 = 0.45
X + X x 4 + X x 2 + X x 8 = 0.45
X x (1+4+2+8)= 0.45
X x 15 = 0.45
X= 0.45 : 15
X= 0.03
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\(\text{0,29 x 8 x 1,25 = ?}\)
\(0.29X8=2.32\)
\(2.32X1.25=\text{2.9}\)
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Cách 1:
\(\left(\dfrac{1}{3}+\dfrac{2}{9}\right)\times\dfrac{4}{9}\)
\(=\dfrac{5}{9}\times\dfrac{4}{9}\)
\(=\dfrac{20}{81}\)
Cách 2:
\(\left(\dfrac{1}{3}+\dfrac{2}{9}\right)\times\dfrac{4}{9}\)
\(=\dfrac{1}{3}\times\dfrac{4}{9}+\dfrac{2}{9}\times\dfrac{4}{9}\)
\(=\dfrac{4}{27}+\dfrac{8}{81}\)
\(=\dfrac{20}{81}\)
C1: \(\left(\dfrac{1}{3}+\dfrac{2}{9}\right)\)x\(\dfrac{4}{9}\)=\(\left(\dfrac{3}{9}+\dfrac{2}{9}\right)\text{x}\dfrac{4}{9}\)=\(\dfrac{5}{9}\text{x}\dfrac{4}{9}=\dfrac{20}{81}\)
C2: \(\left(\dfrac{1}{3}+\dfrac{2}{9}\right)\)x\(\dfrac{4}{9}\)=\(\dfrac{1}{3}\text{ x}\dfrac{4}{9}+\dfrac{2}{9}\text{ x}\dfrac{4}{9}\)=\(\dfrac{4}{27}+\dfrac{8}{81}=\dfrac{12}{81}+\dfrac{8}{81}=\dfrac{20}{81}\)
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a) (16,32 + 20,8) : 4 - 2,12 x 3
= 37,12 : 4 - 6,36
= 9,28 - 6,36
= 2,92
b) 23% : 4 + 31,5% x 2
= 0,23 : 4 + 0,315 x 2
= 0,0575 + 0,63
= 0,6875
a) (16,32 + 20,8) : 4 - 2,12 x 3
= 37,12 : 4 - 6,36
= 9,28 - 6,36
= 2,92
b) 23% : 4 + 31,5% x 2
= 0,23 : 4 + 0,315 x 2
= 0,0575 + 0,63
= 0,6875
Đây nhé bạn ###
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gọi 3 số lần lượt là a,b và c.
ta có: a*2 = c*4
a =c*2 (cùng chia cho 2)
ta có sơ đồ:
a: 2 phần
c:1 phần
hiệu số phần bằng nhau là: 2-1=1(phần)
a là: 2010:1*2=4020
b là: 4020*2:3=2680
xin lồi bạn nha, mình hay nhầm :)
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a: =144+13,2=157,2
b: x-23,5=12,4
nên x=35,9
c: =>x:4,3=36,54
hay x=157,122
\((x-2/3)\times3=3/4\)
`x-2/3=3/4:3`
`x-2/3=1/4`
`x=1/4+2/3`
`x=11/12`
`(x-2/3) xx 3 =3/4`
`x-2/3 = 3/4 : 3 = 1/4`
`x = 1/4 +2/3 = 3/12 + 8/12 =11/12`