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\(y+70y+70\%y=-5,1\)
\(\Leftrightarrow y\left(1+70+70\%\right)=-5,1\)
\(\Leftrightarrow y\left(1+70+\frac{70}{100}\right)=-5,1\)
\(\Leftrightarrow y\left(71+\frac{70}{100}\right)=-5,1\)
\(\Leftrightarrow y\left(\frac{710}{10}+\frac{7}{10}\right)=-5,1\)
\(\Leftrightarrow\frac{717}{10}x=-5,1\)
\(\Leftrightarrow x=-5,1\div\frac{717}{10}\)
\(\Leftrightarrow x=-5,1\times\frac{10}{717}\)
\(\Leftrightarrow x=\frac{-51}{717}\)
y + 70%y = -5,1
\(y.\left(1+\frac{7}{10}\right)=\frac{-51}{10}\)
\(y.\frac{17}{10}=-\frac{51}{10}\)
\(y=\frac{-51}{10}:\frac{17}{10}\)
\(y=-3\)
y +70%y= -5,1
y.(1+70%)= -5,1
y.\(\frac{170}{100}\)= -5,1
y. 1,7= -5,1
y= 5,1:1,7
y=3
a) 14,7 + (-8,4) + (-4,7) = (14,7 - 4,7) + (-8,4)
= 10 - 8,4 = 1,6
b) (-4,2).5,1 + 5,1.(-5,8) = 5,1. (- 4,2 - 5,8)
= 5,1. (-10) = -51
c) (-0,4: 0,04 + 10) . (1,2.20 + 12.8)
= (-10 + 10). (1,2.20 + 12.8)
= 0. (1,2.20 + 12.8) = 0.
a,\(\left(5,1-3,5\right)-\left(3,5+5,1\right)\)
\(=5,1-3,5-3,5-5,1\)
\(=\left[5,1-5,1\right]\)\(-\)\(\left[3,5-3,5\right]\)
\(=0-0\)
\(=0\)
b,c bn tự làm nha
\(25\%y+50\%-y-\frac{3}{4}\cdot y+4\cdot y=10\)
\(\frac{1}{4}y+\frac{1}{2}-y-\frac{1}{4}y+4y=10\)
\(y\left(\frac{1}{4}-\frac{1}{4}-1+4\right)=10-\frac{1}{2}\)
\(3y=\frac{19}{2}\)
\(y=\frac{19}{2}:3\)
\(y=\frac{19}{6}\)
12y+4+10-y.3,5+y=18,15.8
y(12-3,5+1)+14=145,2
y. 9,5+14=145,2
y . 9,5=145,2-14
y . 9,5=131,2
y= 131,2 : 9,5
y=\(13\frac{77}{95}\)
\(5,1\times y-y:10=36,25\times4\)
\(5,1\times y-y\times0,1=145\)
\(\left(5,1-0,1\right)\times y=145\)
\(5\times y=145\)
\(y=145:5\)
\(y=29\)
`5,1 xx y - y : 10 = 36,25 xx 4`
`=>5,1 xx y - y xx 0,1 = 36 x 4 + 0,25 x 4`
`=>y xx (5,1 - 0,1) = 144+1`
`=>y xx 5 = 145`
`=>y=145:5`
`=>y=29`
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