5/3x + 7/2=-2/-3
tìm x
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\(3\times x-45=15\\ =>3\times x=15+45=60\\ =>x=\dfrac{60}{3}=20\)
3.x-45=15
3x=15+45
3x=60
x=60:3
x=20
60 | 78 | 96 | 2 | 20 | 38 | 56 |
76 | 94 | 14 | 18 | 36 | 54 | 58 |
92 | 12 | 16 | 34 | 52 | 70 | 74 |
10 | 28 | 32 | 50 | 68 | 72 | 90 |
26 | 30 | 48 | 66 | 84 | 88 | 8 |
42 | 46 | 64 | 82 | 86 | 6 | 24 |
44 | 62 | 80 | 98 | 4 | 22 | 40 |
9979-3050-9978+3051+x=3
=>2+x=3
=>x=3-2
=>x=1
Tìm số tự nhiên nhỏ nhất sao cho x chia cho x chia 5 dư 4, x chia 7 dư 6 ,x chia 5 dư 6 ,x chia 9 dư
\(\dfrac{72\overline{abc}}{\overline{abc}}=76\\ =>\dfrac{72000}{\overline{abc}}+\dfrac{\overline{abc}}{\overline{abc}}=76\\ =>\dfrac{72000}{\overline{abc}}+1=76\\ =>\dfrac{72000}{\overline{abc}}=75\\ =>\overline{abc}=72000:75=960\)
\(\dfrac{2}{10}.x+\dfrac{3}{10}.x=2\)
\(x.\left(\dfrac{2}{10}+\dfrac{3}{10}\right)=2\)
\(x.\dfrac{5}{10}=2\)
\(x=2:\dfrac{5}{10}\)
\(x=4\)
2029-(x-2)=12
= x - 2 = 2029 - 12
= x - 2 = 2017
= x = 2017 + 2
= x = 2019
\(2029-\left(x-2\right)=12\)
\(\left(x-2\right)=2029-12\)
\(x-2=2017\)
\(x=1008,5\)
\(\dfrac{23}{6}\times\dfrac{5}{3}=\dfrac{23\times5}{6\times3}=\dfrac{115}{18}\)
\(\dfrac{5}{3}x+\dfrac{7}{2}=\dfrac{-2}{-3}\\ =>\dfrac{5}{3}x=\dfrac{2}{3}-\dfrac{7}{2}=-\dfrac{17}{6}\\ =>x=-\dfrac{17}{6}:\dfrac{5}{3}=-\dfrac{17}{10}\)
\(\dfrac{5}{3}x+\dfrac{7}{2}=\dfrac{-2}{-3}\)
\(\dfrac{5}{3}x+\dfrac{7}{2}=\dfrac{2}{3}\)
\(\dfrac{5}{3}x=\dfrac{2}{3}-\dfrac{7}{2}\)
\(\dfrac{5}{3}x=\dfrac{-17}{6}\)
\(x=\dfrac{-17}{6}:\dfrac{5}{3}\)
\(x=\dfrac{-17}{6}.\dfrac{3}{5}\)
\(x=-\dfrac{51}{30}\)