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a, (85 + 15) x y = 4000 c,
100 x y = 4000
y = 4000 : 10
y = 40
b; 18 + y + y + y = 48 x 25
18 + (y + y + y) = 1200
18 + 3y = 1200
3y = 1200 - 18
3y = 1182
y = 1182 : 3
y = 394
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64 x Y + Y - Y x 13 - Y = 4300
Y x ( 64 + 1 - 13 - 1 ) = 4300
Y x 51 = 4300
Y = \(\frac{4300}{51}\)
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64 . x - 13 . x - x = 43
x . (64 - 13 - 1 ) = 43
x . 50 = 43
x = 43 : 50
x = \(\frac{43}{50}.\)
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( x + y ) - ( x - y ) = 64
=> x + y - x + y = 64
=> 2y = 64
=> y = 32
=> x + y >= 0, 64 > 0 => x - y >= 0 => x >= 32 => x = 32 ( ko chắc )
Vậy x = 32, y = 32
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mình trả lời ý a
64 x 25 +35 x 25 +25 x 1
= 25 x ( 64 + 35 + 1 )
= 25 x 100
= 2500
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a) \(y\times15+y\times13=560\times45\)
\(y\times\left(15+13\right)=25200\)
\(y\times28=25200\)
\(y=25200:28\)
\(y=900\)
b) \(y\times345-y\times44-y=123600\)
\(y\times\left(345-44-1\right)=123600\)
\(y\times300=123600\)
\(y=123600:300\)
\(y=412\)
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a) 64% : y = 8
16/25 : y = 8
y = 16/25 : 8
y = 2/25
b) y x 100 = 75%
y x 100 = 3/4
y = 3/4 : 100
y =3/400
64 % : y = 8 y x 100 = 75 %
y = 64 % : 8 y = 75 % : 100
y = 8 % = 0, 08 y = 0, 75 % = 0, 0075
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a) (y - 24) : 28 = 20
y - 24 = 20 x 28
y - 24 = 560
y = 560 + 24
y = 584
vậy y = ...
a.
\(\left(y-24\right):28=20\)
\(\left(y-24\right)=560\)
\(y=584\)
b. \(13\times\left(y-6\right)=4\times y-6\)
\(13\times y-78=4\times y-6\)
\(9\times y=72\)
\(y=8\)
c.\(y\times3+y\times4+y:3+y:4=182\)
\(y\times\left(3+4\right)+y:\left(3+4\right)=182\)
\(y\times\left(7+\dfrac{1}{7}\right)=182\)
\(y=\dfrac{637}{25}\)
64 x y - y x 13 -y = 43
y x (64-13-1)=43
y x 50 =43
y=43:50
y=43/50
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