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a: =>y-7/10=4/10
=>y=11/10
b: \(\Leftrightarrow y\cdot\dfrac{4}{9}=\dfrac{3}{2}\)
hay y=27/8
2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
a) y + 3/7 x 21/9 = 5
y + 3/7 x 7/3 = 5
y + 1 = 5
y = 4
b) y x 3/5 - 1/2 = 4/5
y x 3/5 = 4/5 + 1/2
y x 3/5 = 13/10
y = 13/6
c) 9/8 - y + 2/5 = 1/4
y - 2/5 = 9 /8 - 1/4
y - 2/5 = 7/8
y = 51/40
d) y - 6/5 : 2/3 = 5/6
y - 9/5 = 5/6
y = 79/30
e) y : 7/8 + 3/4 = 7/4
y : 7/8 = 1
y = 7/8
a.34 + Y x 1/5 = 7/8
Y x 1/5 = 7/8 - 34
Y x 1/5 = -33,125
Y = -33,125 : 1/5
Y= -165,625
b.7 x Y - 36 = 4 x Y + 504
7 x Y - 4 x Y = 504 + 36
3 x Y = 540
Y = 180
c.Y x 4 + Y x 5 = 720
Y x 9 = 720
Y = 80
a) 34+y x 1/5=7/8
y x 1/5=7/8-34
y x 1/5=-265/8
y =-265/8 : 1/5
y = -1325/8
b) 7 x y - 36 = 4 x y + 504
7 x y - 4 x y = 504 + 36
y x ( 7-4 ) = 540
y x 3 = 540
y = 540 :3
y = 180
c ) y x 4 + y x 5=720
y x ( 4+5 ) =720
y x 9 = 720
y = 720 : 9
y = 80
a: =y x15/5=3y
b: =(4/6+14/6)+(7/13+19/13)+(17/9-8/9)
=3+2+1
=6
a) \(y\times\dfrac{3}{4}=\dfrac{2}{5}\)
\(y=\dfrac{2}{5}:\dfrac{3}{4}\\ y=\dfrac{8}{15}\)
b) \(y:\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{7}{8}\)
\(y:\dfrac{2}{3}=\dfrac{7}{8}+\dfrac{2}{5}\\ y:\dfrac{2}{3}=\dfrac{51}{40}\\ y=\dfrac{51}{40}\times\dfrac{2}{3}\\ y=\dfrac{17}{20}\)
a)3/4 × (5/6 + 7/8)
=3/4 × 41/24
=41/32
b)3/5 × y=4/7
y=4/7:3/5
y=20/21
12135:(yx4+yx5)=40:8
12135:(yx4+yx5)=5
(yx4+yx5)=12135:5
(yx4+yx5)=2427
yx9=2427
y=2427:9
y=809/3
12135 : ( y x 4 + y x 5 ) = 5
y x 4 + y x 5 = 12135 : 5
y x 4 + y x 5 = 2427
y x ( 4 + 5 ) = 2427
y x 9 = 2427
y = 2427 : 9
y = \(\frac{809}{3}\)