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a) \(y:10+y.3,9=4,8\)
\(\Rightarrow y.0,1+y.3,9=4,8\)
\(\Rightarrow y.\left(0,1+3,9\right)=4,8\)
\(\Rightarrow y.4=4,8\)
\(\Rightarrow y=1,2\)
Vậy y = 1,2
b) \(y.2,5+y.7,5=12,8\)
\(\Rightarrow y.\left(2,5+7,5\right)=12,8\)
\(\Rightarrow y.10=12,8\)
\(\Rightarrow y=1,28\)
Vậy y = 1,28
\(y:2,5+9,6\cdot y=7,5-3\)
\(y:\frac{25}{10}+9,6\cdot y=4,5\)
\(y\cdot\frac{10}{25}+9,6\cdot y=4,5\)
\(y\cdot0,4+9,6\cdot y=4,5\)
\(y\left(0,4+9,6\right)=4,5\)
\(y\cdot10=4,5\)
\(\Rightarrow y=0,45\)
P/s: Hoq chắc :<
y : 2,5 + 9,6 x y = 7,5 - 3
y : \(\frac{25}{10}\) + \(\frac{96}{10}\) x y = 3,5
y x \(\frac{10}{25}\)+ \(\frac{96}{10}\) x y = 3,5
y x (\(\frac{2}{5}+\frac{48}{5}\)) = \(\frac{35}{10}\)
y x \(\frac{50}{5}\)= \(\frac{7}{2}\)
y x 10 = \(\frac{7}{2}\)
y = \(\frac{7}{2}\) : 10
y = \(\frac{7}{2}\) x \(\frac{1}{10}\)
y = \(\frac{7}{20}\)
Ko bik đúng hay ko nữa, sai thì thui đừng k sai nha
= y x 0,1 + y x 3,9 = 4,8
y x (0,1 + 3,9) = 4,8
y x 4 = 4,8
y = 4,8 : 4
y = 1,2
a)\(\frac{45,2}{Y}+\frac{57,8}{Y}-\frac{71,8}{Y}\)=4,8
\(\frac{\left(45,2+57,8\right)-71,8}{Y}\)=4,8
=\(\frac{103-71,8}{Y}=4,8\)
\(\frac{31,2}{Y}=4,8\)
Y=\(\frac{31,2}{4,8}\)
Y=6,5.
b)107,8-\(\frac{Y}{9,5}\)=29,2
\(\frac{Y}{9,5}\)=107,8-29,2
\(\frac{Y}{9,5}\)=78,6
Y=78,6 x 9,5
Y=746,7
Bt2
a)175,84 x 3 -173,4+175,84 x 7 -62,6
=175,84 x (3+7) - (173,4+62,6)
=175,84 x 10 -236
=1758,4-236
=1522,4
b)521,12 x 5 -42,14 x 50+521,12 x 5 -42,14 x 50
=2(521,12 x 5 -42,14 x 50)
= 2 x (5 x (521,12 -42,14 x 10))
=2 x (5 x 99,72)
=2 x 498,6
=997,2.
Cho xin nhá :))
a, 9,8-5,4-1,2=4,4-1,2=3,2
9,8-(5,4+1,2)=9,8-6,6=3,2
b,26,38-7,5-3,16=18,88-3,16=15,72
26,38-(7,5+3,16)=26,38-10,66=15,72
c,37,86-9.2-4,8=28,66-4,8=23,86
37,86-(9,2+4,8)=37,86-14=23,86
\(a.\left(y.100-0,7357\right):0,01=0,55+15,88\)
\(\Leftrightarrow\left(100y-0,7357\right):0,01=16,43\)
\(\Leftrightarrow100y-0,7357=0,1643\)
\(\Leftrightarrow100y=0,9\)
\(\Leftrightarrow y=\frac{9}{1000}\)
\(b.14:\left(0,4+\frac{0,16}{y}\right)=7\)
\(\Leftrightarrow0,4+\frac{0,16}{y}=2\)
\(\Leftrightarrow\frac{0,16}{y}=1,6\)
\(\Leftrightarrow x=0,1\)
\(c.520+7,5.4=y+\frac{175}{5}+30\)
\(\Leftrightarrow520+30=y+65\)
\(\Leftrightarrow550=y+65\)
\(\Leftrightarrow y=485\)
18,5 x y - 7,5 x y - y = 37,08
y x ( 18,5 - 7,5 - 1 ) = 37,08
y x 10 = 17,08
y = 17,08 : 10
y = 1,708
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y x 3 = 7,5 + 4,8
y x 3 = 12,3
y = 12,3 : 3
y = 4,1
Tk mk nha
\(y\cdot3-4.8=7.5\)
\(y\cdot3=7.5+4.8\)
\(y\cdot3=12.3\)
\(y=12,3:3\)
\(=4.1\)