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y : 0,125 + y x 6 - y : 0,25 = 15
y x 8 + y x 6 - y x 4 = 15
y x ( 8 + 6 - 4) = 15
y x 10 = 15
y = 15: 10
y = 1,5
y : 0,125 + y : 0,25 - y x 2 = 300
y x 8 + y x 4 - y x 2 = 300
y x (8 + 4 - 2) = 300
y x 10 = 300
y = 300 : 10
y = 30
0,25 x y = 0,125 + 0,5
0,25 x y = 0,625
y = 0,625 : 0,25
y = 0,25
vậy x = ...
y : 0,25 + y : 0,125 - y x 2 = 58,42
y x 4 + y x 8 - y x 2 = 58,42
y x (4+8-2)=58,42
y x 10 = 58,42
y = 58,42 : 10
y = 5,842
y x 6 + y x 3 + y = 80
y x 6 + y x 3 + y x 1 = 80
y x (6+3+1)=80
y x 10 =80
y =80:10
y =8
a) \(y\times6+y\times3+y=80\)
\(\Leftrightarrow y\times\left(6+3+1\right)=80\)
\(\Leftrightarrow y\times10=80\)
\(\Leftrightarrow y=80\div10\)
\(\Leftrightarrow y=8\)
b) \(y+y\div0,5+y\div0,25+y\div0,125=15\)
\(\Leftrightarrow y+y\times2+y\times4+y\times8=15\)
\(\Leftrightarrow y\times\left(1+2+4+8\right)=15\)
\(\Leftrightarrow y\times15=15\)
\(\Leftrightarrow y=1\)
y:0,2+y:1/2+y:0,25+y:0,125=1900
=> y.5+y.2+ y.4 +y.8=1900
=> y.( 5+2+4+8)=1900
=>y. 19 = 1900
=> y = 1900 :19=100
y:0,25+y:0,125-y x 2=58,42
y:(0,25+0,125)-y x 2 = 58,42
y:0,375-y x 2=58,42
1)\(y\times7:5+4\times8=134\)
\(\Leftrightarrow y\times7:5+32=134\)
\(\Leftrightarrow y\times7:5=102\)
\(\Leftrightarrow y\times7=510\)
\(\Leftrightarrow y=72,86\)
2) \(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{10}\)
\(=0,25:0,25-0,125:0,125+0,5:0,5-\dfrac{1}{10}\)
\(=1-1+1-\dfrac{1}{10}\)
\(=\dfrac{9}{10}\)
y : 0,125 - y x 2 = 6 : 0,25
y x 8 - y x 2 = 6 x 4
y x 8 - y x 2 = 24
y x (8 - 2) = 24
y x 6 = 24
y = 24 : 6
y = 4
⇒ Vậy y = 4