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a) ta có : y + 30/100y = -1,3
hay y(1+ 3/10) = - 13/10
y.13/10 = -13/10
y= -13/10:13/10
y= -1
b) y - 25/100y=1/2
hay y(1-1/4)=1/2
y.3/4 = 1/2
y=2/3
c) 10/3y + 16,75 = -13,25
10/3y= -13,25 - 16,75
10/3y= -30
y= - 30:10/3
y= -9
y+30%y=-1,3
y+0,3y=-1,3
y.(1+0,3)=-1,3
y.1,3=-1,3
y=-1.3:1.3
y=-1
1, y + 30%y = -1,3
y + 3/10 y = -13/10
y.1 + 3/10 y = -13/10
y.( 1 + 3/10 ) = -13/10
y.13/10 = -13/10
y = -13/10 : 13/10
y = -1
vậy y = -1
2, y - 25%y = 1/2
y - 1/4 y = 1/2
y.1 - 1/4 y = 1/2
y.( 1 - 1/4 ) = 1/2
y.3/4 = 1/2
y = 1/2 : 3/4
y = 2/3
vậy y = 2/3
3, 3 1/3 y + 16 3/4 = -13,25
10/3 y + 67/4 = -53/4
10/3 y = -53/4 - 67/4
10/3 y = -30
y = -30 : 10/3
y = -9
vậy y = -9
các bạn hãy tk cho mk nhé,ko pik kết quả có đúg 100% ko nhưng cách làm đúg đó
a, y + 30%y = -1,3
1.y + 30/100y = -13/10
1.y + 3/10y = -13/10
(1 + 3/10). y = -13/10
13/10 .y = -13/10
y = -13/10 : 13/10
y = -13/10 . 10/13
y = -1
b, y - 25%y = 1/2
1.y - 25/100.y = 1/2
1.y - 1/4.y = 1/2
(1 - 1/4) y = 1/2
3/4 .y = 1/2
y = 1/2 : 3/4
y = 1/2 . 4/3
y = 2/3
câu c mik chưa nghĩ ra
Lời giải:
a. $y+30\text{%}y=-1,3$
$y+0,3y=-1,3$
$y(1+0,3)=-1,3$
$y.1,3=-1,3$
$y=(-1,3):1,3=-1$
b.
$y-25\text{%}y=\frac{1}{2}$
$y-0,25y=0,5$
$y(1-0,25)=0,5$
$y.0,75=0,5$
$y=0,5:0,75=\frac{2}{3}$
c.
\(3+\frac{1}{3}y+16+\frac{3}{4}=-13,25\)
$\frac{1}{3}y+19,75=-13,25$
$\frac{1}{3}y=-13,25-19,75=-33$
$y=-33:\frac{1}{3}=-99$
a) y-25%y=1/2
y.1-1/4y=1/2
y(1-1/4)=1/2
y.3/4=1/2
y=1/2:3/4
y=1/2.4/3
y=2/3
a)\(y+30\%y=-1,3\Rightarrow y+\frac{3}{10}y=-1,3\Rightarrow y\left(1+\frac{3}{10}\right)=-1,3\Rightarrow y\times1,3\)\(=-1,3\Rightarrow y=-1\)
b)\(y-25\%y=\frac{1}{2}\Rightarrow y-\frac{1}{4}y=\frac{1}{2}\Rightarrow y\left(1-\frac{1}{4}\right)=\frac{1}{2}\Rightarrow y\times\frac{3}{4}=\frac{1}{2}\Rightarrow y=\frac{1}{2}:\frac{3}{4}\Rightarrow y=\frac{2}{3}\)
c)\(3\frac{1}{3}y+16\frac{3}{4}=13,25\Rightarrow\frac{10}{3}y+\frac{67}{4}=\frac{53}{4}\Rightarrow\frac{10}{3}y=\frac{53}{4}-\frac{67}{4}\Rightarrow\frac{10}{3}y=\frac{-7}{2}\Rightarrow y=\frac{-21}{20}\)
-21/20