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y+ y: 1/3 + y: 0,5 + y: 0,25= 2020
y+ y x 3 + y x 2 + y x 4 = 2020
y x (1+3+2+4) = 2020
y x 10 = 2020
y= 2020:10
y= 202
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y : 1/4 + y × 11 - y × 5 = 1,8
y × 4 + y × 11 - y × 5 = 1,8.
y × (4 + 11 - 5) = 1,8.
y × 10 = 1,8.
y = 1,8 : 10
y = 0,18.
Tích mình nhen, học tốt ^^
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a. = 0,25 : 0,25 + 0,4 x 2,5 + 0,2 x 5
= 1 + 1 + 1
= 3
b. y x ( 7 + 1 + 12 - 6 - 4) = 45
y x 9 = 45
=> y = 5
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a) y x 3 = 8.4
y = 8.4 : 3
y = 2.8
b) 5 x y = 0.25
y = 0.25 : 5
y = 0.05
a, y x 3 =8,4
y=8,4 : 3
y=2,8
b, 5 x y = 0,25
y=0,25 : 5
y =0,05
ai tích mk lun đc nhìu may mắn
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\(\Leftrightarrow\) y\(\times\)1/4 + y \(\times\)1/2 + y \(\times\)1/4 + y= 20
\(\Leftrightarrow\)y\(\times\) ( 1/4+1/2+1/4+1)=20
\(\Leftrightarrow\) y\(\times\)2=20
\(\Leftrightarrow\) y=10
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\(a)\frac{9}{4}\times y=\left[\frac{5}{7}-\frac{3}{14}\right]\times\frac{4}{7}\)
\(\Rightarrow\frac{9}{4}\times y=\left[\frac{10}{14}-\frac{3}{14}\right]\times\frac{4}{7}\)
\(\Rightarrow\frac{9}{4}\times y=\frac{1}{2}\times\frac{4}{7}\)
\(\Rightarrow\frac{9}{4}\times y=\frac{2}{7}\)
\(\Rightarrow y=\frac{2}{7}:\frac{9}{4}=\frac{8}{63}\)
b, Tương tự câu a
y x 5 + y : 0,25 + y = 2020
=> y x 5 + y : \(\frac{25}{100}\)+ y = 2020
=> y x 5 + y : \(\frac{1}{4}\)+ y = 2020
=> y x 5 + y x 4 + y = 2020
=> y x (5 + 4 + 1) = 2020
=> y x 10 = 2020
=> y = 2020 : 10 = 202
=Y x 5 + Y x 4 + y x 1
=Y x [ 5+4 +1 ]
=Y x10
Y= 2020 : 10
Y= 202