15 x Y + 15 x 2,7 = 105
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15.x + 15.2,7 =105
15.x + 40,5 = 105
15.x = 105 - 40,5
15.x = 64,5
x = 64,5 : 15
x = 4,3
\(15\cdot x+15\cdot2,7=105\)
\(15\cdot x+40,5=105\)
\(15\cdot x=105-40,5\)
\(15\cdot x=64,5\)
\(x=64,5:15\)
\(x=4,3\)
4/25 + x/13 =0,76
=> x/13 = 0,76 -4/25
=> x/13 = 0,6
=> x = 0,6 x 13
=> x = 7,8
\(\frac{4}{25}+\frac{x}{13}=0,76\Leftrightarrow\frac{x}{13}=\frac{19}{25}-\frac{4}{25}=\frac{3}{5}\Leftrightarrow x=\frac{3.13}{5}=\frac{39}{5}\)
\(15.x+15.2,7=105\Leftrightarrow15.\left(x+2,7\right)=105\Leftrightarrow x+2,7=7\Leftrightarrow x=7-2,7=4,3\)
y + y x 2,7 + y x 6,3 = 162 : 15
y x (1 + 2,7 + 6,3) = 10,8
y x 10 = 10,8
y = 10,8 : 10
y = 1,08
15 x X + 15 x 2,7 = 15
15 x ( X + 2,7) = 15
X + 2, 7 = 15 : 15
X + 2,7 = 1
X = 1 - 2,7
X = - 1,7
a) y x 3,9 + y x 0,1 = 2,7
y x ( 3,9 + 0,1 ) = 2,7
y = 2,7 : 4
y = 0,675
b) 12, 3 : y - 4,5 : y = 15
( 12,3 - 4,5 ) : y =15
7,8 : y = 15
y = 7,8 : 15
y = 0,52
a) \(\left(x-15\right)-75=0\\ \Leftrightarrow x-15=75\\ \Leftrightarrow x=90\)
b) \(575-\left(6x+70\right)=445\\ \Leftrightarrow6x+70=130\\ \Leftrightarrow6x=60\\ \Leftrightarrow x=10\)
c) \(x-105:21=15\\ \Leftrightarrow x-5=15\\ \Leftrightarrow x=20\)
d) \(\left(x-105\right):21=15\\ \Leftrightarrow x-105=315\\ \Leftrightarrow x=420\)
a) ( x - 15 ) - 75 = 0
x -15 = 75 + 0
x - 15 = 75
x= 75 + 15
x = 90
b) 575- (6x +70) =445
6x + 70 = 575 - 545
6x + 70 = 130
6x = 130 - 70
6x = 60
x = 60 : 6
x = 10
c) x –105 : 21 =15
x –105 = 15 x 21
x -105 = 315
x = 315 + 105
x = 420
d) (x - 105) :21 = 15
x - 105 = 21
x = 105 + 21
x = 126
Theo bài ra , ta có :
\(\frac{15}{x}=\frac{y}{21}=\frac{31}{105}\)
\(\Rightarrow x=5\)
Vì \(105:21=5\)
Nên \(\Rightarrow y=\frac{31}{15}\)
Vậy \(x=5;y=\frac{31}{15}\)
a) 35-15+x=70
=> 20+x=70
=> x=50
b) 568-(2x+14)=15
=> 2x+14=553
=> 2x=539
=> x=269,5
c) x-105:21=15
=> x-5=15
=> x=20
d) (x-105)*21=15
=> x-105=5/7
=> x=5/7+105
=> x=740/7
a, 35 - 15 + x = 70 b, 568 - (2.x + 14 )= 15
x = 70 - 35 + 15 2.x + 14 = 568 - 15
x = 50 2.x + 14 =553 => 2.x =553-14=539 =>x=539 : 2 =269.5
c, x - 105 : 21 =15 d, (x - 105) . 21 = 15
x - 105 = 15 x 21 x - 105 = 15 : 21
x - 105 = 315 x - 105 = \(\frac{5}{7}\)
x = 315+105 x = \(\frac{5}{7}\)+ 105
x = 420 x = \(\frac{740}{7}\)
\(15.y+15.2,7=105\)
\(15\left(y+2,7\right)=105\)
\(y+2,7=7\)
\(y=4,3\)
Vậy.....
15 x Y + 15 x 2,7 = 105
=> 15 x ( Y + 2,7 ) = 105
=> Y + 2,7 = 105 : 15
Y + 2,7 = 7
Y = 7 - 2,7
Y = 4,3