Tìm y:
9/14 x y = [ 5/7 - 3/14 ] x 4/7
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a) y : 4/11 x 3/5 = 27/4
y : 4/11 = 27/4 : 3/5
y : 4/11 = 45/4
y = 45/4 x 4/11
y = 45/11
b) y + 7/2 - 5/9 = 14/3
y + 7/2 = 14/3 + 5/9
y + 7/2 = 47/9
y = 47/9 - 7/2
y = 31/18
a) y : 4/11 x 3/5 = 27/4
y : 4/11 = 27/4 : 3/5
y : 4/11 = 45/4
y = 45/4 x 4/11
y = 45/11
b) y + 7/2 - 5/9 = 14/3
y + 7/2 = 14/3 + 5/9
y + 7/2 = 47/9
y = 47/9 - 7/2
y = 31/18
( 2 x y + 2/15 ) x 3 = 4/5
( 2 x y + 2/15 ) = 4/5 : 3
( 2 x y + 2/15 ) = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 :2
y = 1/15
(2 x y + 2/15) x 3 = 4/5
2 x y + 2/15) = 4/5 : 3
2 x y + 2/15 = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 : 2
y = 1/15
7/9 x (2 - 1/3 x y) = 14/15
(2 - 1/3 x y) = 14/15 : 7/9
(2 - 1/3 x y) = 6/5
2 - y = 6/5 x 1/3
2 - y = 2/5
y = 2/5 + 2
y = 12/5
4/21 + 5 x y - 8/7 = 1/3
4/21 + 5 x y = 1/3 + 8/7
4/21 + 5 x y = 31/21
5 x y = 31/21 - 4/21
5 x y = 9/7
y = 9/7 : 5
y = 9/35
7/12 x y - 3/12 x y = 5
y x (7/12 - 3/12) = 5
y x 1/3 = 5
y = 5 : 1/3
y = 15
a.
x/y x 3/4 = 5/6 + 1/3
x/y x 3/4 = 7/6
x/y = 7/6 : 3/4
x/y = 14/9
b.
7/9 : x/y = 10/7 - 13/14
7/9 : x/y = 1/2
x/y = 7/9 : 1/2
x/y = 14/9
cho 1 k nha bn
a) y = 5/14 : 6/7
y = 5/12
vậy y = 5/12
b) y = 4/9 x 2/3
y = 8/27
vậy t = 8/27
c) y = 1/2 - 3/10
y = 1/5
vậy y = 1/5
d) y = 5/6 - 1/3
y = 1/2
vậy y = 1/2
a 9/15 x y = (5/7 +3/14) x 4/7
9/15 x y = 13/14 x 4/7
9/15 x y = 26/49
y= 26/49 : 9/15
y= 130/147
b, y : 0,25 = (2,5-1,3) : 0,75
y : 1/4 = 8/5
y= 8/5 x 1/4 = 2/5
a/
9/14 x y = (5/7 + 3/14) x 4/7
9/14 x y = 13/14 x 4/7
9/14 x y = 26/49
y = 26/49 : 9/14
y = 52/63
b/
y : 0,25= (2,5 - 1,3) : 0,75
y : 0,25= 1,2 : 0,75
y : 0,25= 1,6
y = 1,6 x 0,25
y = 0,4
chúc học tốt nhé!!! học giỏi !!!
a: =y x15/5=3y
b: =(4/6+14/6)+(7/13+19/13)+(17/9-8/9)
=3+2+1
=6
\(a)\frac{9}{4}\times y=\left[\frac{5}{7}-\frac{3}{14}\right]\times\frac{4}{7}\)
\(\Rightarrow\frac{9}{4}\times y=\left[\frac{10}{14}-\frac{3}{14}\right]\times\frac{4}{7}\)
\(\Rightarrow\frac{9}{4}\times y=\frac{1}{2}\times\frac{4}{7}\)
\(\Rightarrow\frac{9}{4}\times y=\frac{2}{7}\)
\(\Rightarrow y=\frac{2}{7}:\frac{9}{4}=\frac{8}{63}\)
b, Tương tự câu a
9/14 x y = (5/7 - 3/14 ) x 4/7
9/14 x y = (10/14 - 3/14 ) x 4/7
9/14 x y = 1/2 x 4/7
9/14 x y = 2/7
y = 2/7 : 9/14
y = 2/7 x 14/9
y = 4/9
9/14 × y = (5/7 - 3/14) × 4/7
9/14 × y = 1/2 × 4/7
9/14 × y = 2/7
y = 2/7 : 9/14
y = 4/9