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= \(y\) x ( 2+3+5)= 1500
= y x 10 = 1500
y = 1500 : 10
y = 100
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\(y\times\frac{3}{5}+y\times\frac{2}{7}=\frac{31}{70}\)
\(\Leftrightarrow y\times\left(\frac{3}{5}+\frac{2}{7}\right)=\frac{31}{70}\)
\(\Leftrightarrow y\times\frac{31}{35}=\frac{31}{70}\)
\(\Leftrightarrow y=\frac{1}{2}\)
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y-3/4= 5/12:10/3 y-3/4 =5/12*3/10 y -3/4=1/8 y=1/8+3/4 y=7/8
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Đề đúng phải như này
\(\dfrac{3}{7}\) < y < \(\dfrac{4}{7}\)
\(\dfrac{3}{7}\) = \(\dfrac{3\times5}{7\times5}\) = \(\dfrac{15}{35}\) \(\dfrac{4}{7}\) = \(\dfrac{4\times5}{7\times5}\) = \(\dfrac{20}{35}\)
Bốn phân số thỏa mãn đề bài lần lượt là:
\(\dfrac{16}{35}\); \(\dfrac{17}{35}\); \(\dfrac{18}{35}\); \(\dfrac{19}{35}\)
\(\dfrac{3}{7}=\dfrac{30}{70};\dfrac{4}{7}=\dfrac{40}{70}\)
=> 4 giá trị thỏa mãn là: \(\dfrac{31}{70};\dfrac{33}{70};\dfrac{37}{70};\dfrac{39}{70}\)
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yx12+yx13-y=4872
yx(12+13-1)=4872
yx24=4872
y=4872:24
y=203
vay y=203
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486 : y - 126 : y = 6
( 486 - 126 ) : y = 6
360 : y = 6
=> y = 360 : 6
y= 60
b, y x 70 = 42000 : 60
y x 70 = 700
y = 700 : 70
y = 10
a)
\(486:y-126:y=6\)
\(\left(486-126\right):y=6\)
\(360:y=6\)
\(y=360:6\)
Vậy \(y=60\)
b)
\(y\times70=42000:60\)
\(y=\frac{42000:60}{70}\)
Vậy \(y=10\)
nha
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1500 - y*3 = y*2
1500 = y*3 +y*2
1500 = 5y
y = 1500 : 5
y = 300
1500-y*3=y*2
=> y*2+y*3=1500
=> y*(2+3)=1500
=>y*5=1500
=>y=300