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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
64 x Y + Y - Y x 13 - Y = 4300
Y x ( 64 + 1 - 13 - 1 ) = 4300
Y x 51 = 4300
Y = \(\frac{4300}{51}\)
64 . x - 13 . x - x = 43
x . (64 - 13 - 1 ) = 43
x . 50 = 43
x = 43 : 50
x = \(\frac{43}{50}.\)
mình trả lời ý a
64 x 25 +35 x 25 +25 x 1
= 25 x ( 64 + 35 + 1 )
= 25 x 100
= 2500
( 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
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
a ) 64 x y = 2880 - 192
=> 64 x y = 2688
=> y = 2688 : 64
=> y = 42
b) 10 - y = 46,8 : 6,5
=> 10 - y = 7,2
=> y = 10 - 7,2
=> y = 2,8
c) 7 + y = 25/3
=> y = 25/3 - 7
=> y = 4/3
64 * y = 2880 - 192
64 * y = 2688
y = 2688 : 64
y = 42
10 - y = 46.8 : 6.5
10 - y = 7.2
y = 10 - 7.2
y= 2.8
7 + y = 25/3
y = 25/3 - 7
y = 25/3 - 21/3
y = 4/3
y x 9 + y x 8 + y x 13 = 99
y x ( 9 + 8 + 13 ) = 99
y x 30 = 99
y = 99 : 30
y = 3,3
y x 9 + y x 8 y x 13 = 99
y x 30 = 99
y = 99 / 30
y = 3,3 tk mk,mk tk lại!
\(1,x+4\cdot25=1000\)
\(\Rightarrow x+100=1000\)
\(\Rightarrow x=900\)
\(2,y\cdot17+y\cdot15+y\cdot1-y\cdot3=1860\)
\(\Rightarrow y\cdot\left(17+15+1-3\right)=1860\)
\(\Rightarrow30y=1860\)
\(\Rightarrow y=62\)
\(3,y\cdot33-y\cdot3=1860\)
\(\Rightarrow y\left(33-3\right)=1860\)
\(\Rightarrow30y=1860\)
\(\Rightarrow y=62\)
\(4,142-\frac{x}{2}=43\)
=?\(\frac{x}{2}=99\)
=>\(x=198\)
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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