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\(a,30+X=120:5+27\\ 30+X=24+27\\ 30+X=51\\ X=51-30=21\\ ---\\ b,40-3\times X=13\\ 3\times X=40-13=27\\ X=\dfrac{27}{3}=9\\ ---\\ 2\times X-8=16\\ 2\times X=16+8\\ 2\times X=24\\ X=\dfrac{24}{2}=12\\ \\---\\ \dfrac{1}{2}\times X-\dfrac{1}{3}=\dfrac{1}{4}\\ \dfrac{1}{2}\times X=\dfrac{1}{4}+\dfrac{1}{3}=\dfrac{7}{12}\\ X=\dfrac{7}{12}:\dfrac{1}{2}=\dfrac{7}{6}\)
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1: \(\overline{abc}\)
a có 3 cách
b có 3 cách
c có 2 cách
=>Có 3*3*2=18 số
3A
2: =>10x+55=64
=>10x=9
=>x=9/10
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(A=\frac{3\cdot x+27}{x+4}=15\)
=> \(3x+27=15x+60\)
=> \(-33=12x\Rightarrow x=\frac{-12}{33}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{64.50+40.100}{27.38+146.19}\)
\(=\frac{3200+4000}{1026+2774}\)
\(=\frac{7200}{3800}\)
\(=\frac{36}{19}\)
64 x 50 + 40 x 100 / 27 x 38 + 146 x 19
= 32 x 2 x 50 + 40 x 100 / 27 x 38 + 73 x 2 x 19
= 32 x 100 + 40 x 100 / 27 x 38 + 73 x 38
= 100 x ( 32 + 40) / 38 x ( 27 + 73)
= 100 x 72 / 38 x 100
= 72/38 = 36/19
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64x100+50x44
=2200+6400
=8600
1026+2774
=3800
mình làm đúng ko vậy
TL:
= 3800
nhé
K CHO MK NHAAAAAAA
BNNNNNNNNNNNNNNNNNNNNNNNNNN
~~HT~~
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x:17=40-3,6\)
\(x:17=36,4\)
\(x=36,4\times17\)
\(x=618,8\)
\(15-x:27=7,2\)
\(x:27=15-7,2\)
\(x:27=7,8\)
\(x=7,8\times27\)
\(x=210,6\)
a) =x : 17 = 36,4 b) 15 - x : 27 =7,2
x = 36,4 * 17 x : 27 = 7,8
x = 618,8 x = 7,8 * 27
x = 21,6
nho kminh nhe
x = 618,8
\(64-x(3x-27)\div2=40\)
\(\Rightarrow x(3x-27)\div2=64-40\)
\(\Rightarrow x(3x-27)\div2=24\)
\(\Rightarrow x(3x-27)=24\div2\)
\(\Rightarrow x(3x-27)=12\)
\(\Rightarrow4x+27x=12\)
\(\Rightarrow x(27+4)=12\)
\(\Rightarrow31x=12\)
\(\Rightarrow x\in\varnothing\)