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\(a,x-36:18=12-15\\ \Rightarrow x-2=-3\\ \Rightarrow x=-1\\ b,92-\left(17+x\right)=72\\ \Rightarrow17+x=20\\ \Rightarrow x=3\\ c,720:\left[41-\left(2x+5\right)\right]=40\\ \Rightarrow41-\left(2x+5\right)=18\\ \Rightarrow2x+5=23\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ d,\left(x+2\right)^3-23=41\\ \Rightarrow\left(x+2\right)^3=64\\ \Rightarrow\left(x+2\right)^3=4^3\\ \Rightarrow x+2=4\\ \Rightarrow x=2\)
a. 2x + 70 = 74
<=> 2x = 4
<=> x = 2
b. 120 - \(\dfrac{4x}{2}\) = 80
<=> 120 - 2x = 80
<=> 120 - 80 = 2x
<=> 2x = 40
<=> x = 20
c. (3x + 5)2 = 400
<=> \(|3x+5|=\sqrt{400}\)
<=> \(|3x+5|=20\)
<=> \(\left[{}\begin{matrix}3x+5=20\\3x+5=-20\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=\dfrac{-25}{3}\end{matrix}\right.\)
Lời giải:
a. $21-2(x+6)=15$
$2(x+6)=21-15=6$
$x+6=6:2=3$
$x=3-6=-3$
b.
$3^{x+1}=27=3^3$
$\Rightarrow x+1=3$
$\Rightarrow x=2$
c.
$14-x=36$
$x=14-36=-22$
d.
$-3x+25=-2$
$-3x=-2-25=-27$
$x=(-27):(-3)=9$
e.
$37-2(x+6)=29$
$2(x+6)=37-29=8$
$x+6=8:2=4$
$x=4-6=-2$
h.
$2^{x-1}=16=2^4$
$x-1=4$
$x=4+1=5$
a.460+340=(x-200)x4
800=(x-200)x4
800:4=x-200
200=x-200
x=200+200
x=400
b.x=53
b: Ta có: 7x-8=713
nên 7x=721
hay x=103
c: Ta có: x-36:18=12
nên x-2=12
hay x=14
d: Ta có: (x-36):18=12
nên x-36=216
hay x=252
a) \(\left(x-53\right)-125=0\)
\(\Leftrightarrow x-53=125\)
\(\Leftrightarrow x=178\)
b) \(135-\left(x+37\right)=80\)
\(\Leftrightarrow x+37=55\)
\(\Leftrightarrow x=18\)
c) \(321+\left(225-x\right)=421\)
\(\Leftrightarrow225-x=100\)
\(\Leftrightarrow x=125\)
d) \(\left(x-36\right):18=12\)
\(\Leftrightarrow x-36=216\)
\(\Leftrightarrow x=252\)
e) \(x-36:18=12\)
\(\Leftrightarrow x-2=12\)
\(\Leftrightarrow x=14\)
\(a.\left(x-53\right)-125=0\)
=>\(x-53=0+125\)
=>\(x-53=125\)
=>\(x=125+53\)
=>\(x=178\)
\(b.135-\left(x+37\right)=80\)
=> \(x+37=135-80\)
=>\(x+37=55\)
=>\(x=55-37\)
=>\(x=18\)
\(c.321+\left(225-x\right)=421\)
=>\(225-x=421-321\)
=>\(225-x=100\)
=>\(x=225-100\)
=>\(x=125\)
\(d.\left(x-36\right):18=12\)
=>\(x-36=12x18\)
=>\(x-36=216\)
=>\(x=216+36\)
=>\(x=252\)
\(e.x-36:18=12\)
=>\(x-2=12\)
=>\(x=12+2\)
=>\(x=14\)
b; 36. 42 - 62.5 + 63 .62
= 36.42 - 36.5 + 63.36
= 36.(42 - 5 + 63)
= 36.100
= 3600
a. x - 36 = -15
=> x = -15 + 36
=> x = 21
b. 5.(x - 37) = -80
=> x - 37 = -80 : 5
=> x - 37 = -16
=> x = -16 + 37
=> x = 21
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