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Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112=100
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
45x . 45123 = 45126
45x+123 = 45126
x + 123 = 126
x = 126-123
x = 3
Vậy x=3
\(45^x.45^{123}=45^{126}\)
\(45^x=45^{126}:45^{123}\)
\(45^x=45^{126-123}\)
\(45^x=45^3\)
\(\Rightarrow x=3\)
Vậy x=3
Ta có : a = 45 = 32 . 5
b = 204 = 22 . 3 . 17
c = 126 = 2 . 32 . 7
=> ƯCLN(a,b,c) = 3
=> BCNN(a,b,c) = 22 . 32 . 5 . 17 . 7 = 21 420
Vậy ƯCLN(a,b,c) = 3 và BCNN(a,b,c) = 21 420
ƯCLN(a,b,c)=ƯCLN(ƯCLN(a,b),c) = ƯCLN(ƯCLN(45,204),126)=3
BCNN(a,b,c)=BCNN(BCNN(a,b),c)=BCNN(BCNN(45,204),126) = 21420
a) ƯCLN ( 84, 126, 210 )
84 = 22 . 3 . 7
126 = 2 . 32 . 7
210 = 2 . 3 . 5 . 7
ƯCLN ( 84, 126, 210 ) = 2 . 3 . 7 = 42
➤ ƯCLN ( 84, 126, 210 ) = 42
b) BCNN ( 36, 45, 63 )
36 = 22 . 32
45 = 32 . 5
63 = 32 . 7
BCNN ( 36, 45, 63 ) = 22 . 32 . 5 . 7 = 1260
BCNN ( 36, 45, 63 ) = 1260
a) \(39-x+\left[28-\left(48-2\cdot13\right)\right]=-15\)
\(39-x+\left[28-\left(48-26\right)\right]=-15\)
\(39-x+\left[28-24\right]=-15\)
\(39-x+4=-15\)
\(39-x=-15-4=-19\)
\(x=39-\left(-19\right)=58\)
xong ý A rùi
b) \(\left(-45\right)-x-\left[126-\left(52-165\right)\right]=85-22\)
\(\left(-45\right)-x-\left[125-\left(-113\right)\right]=63\)
\(\left(-45\right)-x-238=63\)
\(\left(-45\right)-x=63+238=301\)
\(x=\left(-45\right)-301=-346\)
xong ý B rùi
l-45l.l3l+l-126l:l-6l
=45.3+126:6
=135+21=156
=45.3+126:6
=135+21
=156