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Câu 1: \(-7/6+15/6=8/6=4/3\)
Câu 2: \(x=7/12-1/6=>x=7/12-2/12=>x=5/12\) nhé =)
câu 1
\(\dfrac{-7}{6}+\dfrac{15}{6}=\dfrac{-7+15}{6}=\dfrac{8}{6}=\dfrac{4}{3}\)
câu 2
\(x+\dfrac{1}{6}=\dfrac{7}{12}\)
\(x=\dfrac{7}{12}-\dfrac{1}{6}\)
\(x=\dfrac{7}{12}-\dfrac{2}{12}=\dfrac{7-2}{12}\)
\(x=\dfrac{5}{12}\)
0,75x-3,5=-0,25x
0,75x+0,25x=3,5
x(0,75+0,25)=3,5
x.1=3,5
x=3,5
Chúc bạn học tốt!
73\(x-2\) -3.73 = 73.4
7\(3x-2\) = 73.4 + 73.3
73\(x-2\) = 73.(4 + 3)
73x - 2 = 73.7
73\(x-2\) = 74
3\(x\) - 2 = 4
3\(x\) = 4 + 2
3\(x\) = 6
\(x\) = 6 : 3
\(x\) = 2
`2,86 . 4 + 3,14 . 4 – 6,01 . 5 + 32. 0,75`
`=4.(2,86+3,14)-30,05+24`
`=4.6-30,05+24`
`=24-30,05+24`
`=17,95`
2,86 . 4 + 3,14 . 4 – 6,01 . 5 + 32. 0,75
=4 . (2,86+3,14) − 30,05 + 24
=4 . 6 − 30,05 + 24
=24 − 30,05 + 24 = (24 + 24) -30,05
=17,95
125 x13-125 x87
= 125 x ( 13 - 87 )
= 125 x ( -74 )
= -9250
\(\frac{1}{2}+\frac{1}{5}+\frac{2}{9}\)
=\(\frac{45}{90}+\frac{18}{90}+\frac{20}{90}\)
=\(\frac{83}{90}\)
\(\Leftrightarrow x\left(\dfrac{3}{2.5}+\dfrac{3}{5.8}+\dfrac{3}{8.11}+\dfrac{3}{11.14}\right)=\dfrac{1}{21}\)
\(\Leftrightarrow x\left(\dfrac{5-2}{2.5}+\dfrac{8-5}{5.8}+\dfrac{11-8}{8.11}+\dfrac{14-11}{11.14}\right)=\dfrac{1}{21}\)
\(\Leftrightarrow x\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+...+\dfrac{1}{11}-\dfrac{1}{14}\right)=\dfrac{1}{21}\)
\(\Leftrightarrow x\left(\dfrac{1}{2}-\dfrac{1}{14}\right)=\dfrac{1}{21}\Leftrightarrow x.\dfrac{3}{7}=\dfrac{1}{21}\Leftrightarrow x=\dfrac{1}{9}\)
x=0.1111111111