Bài 3:Tìm y:y+19₫84 36-y₫14
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\(y-36=y\div y+1\)
\(y-36=1+1\)
\(y-36=2\)
\(y=2+36\)
\(y=38\)
Vậy \(y=38\)
\(y-36=y:y+1\)
\(y-36=1+1\)
\(y-36=2\)
\(y=2+36\)
\(y=38\)
2/ Tìm y:
y + \(\dfrac{1}{3}\) x 4 = 12 \(\dfrac{2}{5}\) + y = \(\dfrac{12}{35}\) x \(\dfrac{14}{9}\)
\(y=12-\left(\dfrac{1}{3}\times4\right)=12-\dfrac{4}{3}=\dfrac{32}{3}\)
\(y=\left(\dfrac{12}{35}\times\dfrac{14}{9}\right)-\dfrac{2}{5}=\dfrac{8}{15}-\dfrac{2}{5}=\dfrac{2}{15}\)
1) x - 3 = 19 - x \(\Rightarrow\)x + x = 19 + 3 \(\Rightarrow\)2x = 22 \(\Rightarrow\)x = 11
2) -14 - y = 36 -( -y ) -( - 24 ) \(\Rightarrow\)-14 - y = 36 + y +24 \(\Rightarrow\)-y - y = 36 + 24 + 14 \(\Rightarrow\)-2y = 74 \(\Rightarrow\)y = -37
3) 10 - y = 4 + y \(\Rightarrow\)10 - 4 = y + y \(\Rightarrow\)6 = 2y \(\Rightarrow\)y = 3
a) [( 6.x-72):2-84].28(thiếu đề)
b) (19.x + 2.52) :14= (13-8)2 - 4
(19.x + 2.25) :14= 5.2 - 4
(19.x + 50) :14=10- 4
(19.x + 50) :14=6
19.x + 50=6.14
19.x +50=84
19.x=84-50
19.x=34
x=34:19
x=34/19
c) 84:(324:18+36-x)+15=19
=> 84:(324:18+36-x)=19-15
=> 84:(324:18+36-x)=4
=> 324:18+36-x=84:4=21
=> 18+36-x = 21
=> 54-x = 21
=> x = 54-21
=> x = 33
84 : ( 18+36-x) +15= 19
84:(54-x)+15=19
84:(54-x) =19+15
84:(54-x)= 34
54-x =84:34
54-x =\(\frac{42}{17}\)
x = 54 - \(\frac{42}{17}\)
x= \(\frac{816}{17}\)
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