22 - (x +5) :5 = 2
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a. \(x-\dfrac{3}{2}=\dfrac{5}{6}\)
\(x=\dfrac{5}{6}+\dfrac{3}{2}\)
\(x=\dfrac{14}{6}=\dfrac{7}{3}\)
a: \(=\dfrac{3}{5}:\dfrac{7}{5}=\dfrac{3}{5}\cdot\dfrac{5}{7}=\dfrac{3}{7}\)
b: \(=\dfrac{9}{17}\left(\dfrac{8}{5}-\dfrac{3}{5}\right)+\dfrac{8}{17}\)
=9/17+8/17=1
c: =>x-3/10=7/15*1/5=7/75
=>x=7/75+3/10=59/150
Ta có: (x + 2)2 – 4 ≥ (x + 3)(x + 5) – x
⇔ x2 + 4x + 4 – 4 ≥ x2 + 5x + 3x + 15 – x
⇔ –3x ≥ 15 ⇔ x ≤ –5
Tập nghiệm: S = {x | x ≤ –5}.
1, =4/9 x (3/7 + 2 x 4/7) - 1/9 - 3/9
= 4/9 x 1 - 1/9 - 3/9 = 0
2, = ( 22/5 x 5/22 ) x 12
= 1 x 12 = 12
a, \(\frac{2}{3}\)x \(\frac{10}{21}\)x \(\frac{3}{2}\)= \(\frac{2x10x3}{3x21x2}\) = \(\frac{10}{21}\)
b, \(\frac{22}{5}\)x \(12\)x\(\frac{5}{22}\) = \(\frac{22x12x5}{5x22}\) = \(12\)
\(\frac{22}{5}:x=\frac{44}{5}:\frac{5}{2}\)
\(\frac{22}{5}:x=\frac{44}{5}x\frac{2}{5}\)
\(\frac{22}{5}:x=\frac{88}{25}\)
\(x=\frac{22}{5}:\frac{88}{25}\)
\(x=\frac{22}{5}x\frac{25}{88}\)
\(x=\frac{5}{4}\)
22 - ( x + 5) : 5 = 2
(x +5 ) : 5 = 22- 2
(x + 5) : 5 = 20
x + 5 = 20 x 5
x + 5 = 100
x = 100 - 5
x = 95