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\(1,\Leftrightarrow7x=42\Leftrightarrow x=6\\ 2,\Leftrightarrow36-4x=4\Leftrightarrow4x=32\Leftrightarrow x=8\\ 3,\Leftrightarrow3x=35\Leftrightarrow x=\dfrac{35}{3}\\ 4,\Leftrightarrow x-12=144\Leftrightarrow x=156\\ 5,\Leftrightarrow x-14=16\Leftrightarrow x=30\\ 6,\Leftrightarrow3x-24=\dfrac{148}{73}\Leftrightarrow3x=\dfrac{1900}{73}\Leftrightarrow x=\dfrac{1900}{219}\\ 7,\Leftrightarrow33+x=45\Leftrightarrow x=12\\ 8,Sai.đề\\ 9,\Leftrightarrow\left(x+9\right):2=39\Leftrightarrow x+9=78\Leftrightarrow x=69\\ 11,\Leftrightarrow2\left(x+7\right)=38\Leftrightarrow x+7=19\Leftrightarrow x=12\\ 13,\Leftrightarrow2\left(x-51\right)=66\Leftrightarrow x-51=33\Leftrightarrow x=84\)
\(15,\Leftrightarrow x-19=9\Leftrightarrow x=28\\ 17,\Leftrightarrow\left(x-3\right):2=48\Leftrightarrow x-3=96\Leftrightarrow x=99\\ 19,\Leftrightarrow0x=46\Leftrightarrow x\in\varnothing\\ 8,Sai.đề\\ 14,\Leftrightarrow2x=209\Leftrightarrow x=\dfrac{209}{2}\\ 16,\Leftrightarrow2x+6=157\Leftrightarrow2x=151\Leftrightarrow x=\dfrac{151}{2}\\ 18,\Leftrightarrow5\left(x+4\right)=100\Leftrightarrow x+4=20\Leftrightarrow x=16\\ 20,\Leftrightarrow\left(3x-5\right)^3=27=3^3\Leftrightarrow3x-5=3\Leftrightarrow x=\dfrac{8}{3}\)
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a, Ta có: 45 = 3 2 . 5 và 105 = 3.5.7. Vậy ƯCLN(45,105) = 3.5 = 15
b, Ta có: 56 = 2 3 . 7 và 182 = 2.7.13. Vậy ƯCLN(56,182) = 2.7 = 14
c, Ta có: 36 = 2 2 . 3 2 ; 60 = 2 2 . 3 . 5 và 72 = 2 3 . 3 2 . Vậy ƯCLN(36,60,72) = 2 2 . 3 = 12
d, Ta có: 48 = 2 4 . 3 ; 120 = 2 3 . 3 . 5 và 150 = 2 . 3 . 5 2 . Vậy ƯCLN(48,120,150) = 2.3 = 6
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(-6).43+45.(-6)+12.(-6)=(-6).(43+45+12)=(-6).100=(-600)
5.(-18-105)-105.(18-5)=5.(-18)+5.(-105)-105.(-18)+105.5=5.(-18)-105.(-18)=(-18).100=(-1800)
TICK MIK NHÉ.MIK TRẢ LỜI NHAH NHỨT NÈK
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a. (-6) . 43 + 45.(-6) + 12.(-6)
= (-6) . (43 + 45 + 12)
= (-6) . 100
= -600
b. 5.(18 - 105) - 105.(18 - 5)
= 5.18 - 5.105 - 105.18 + 105.5
= 5.18 - 105.18
= 18.(5 - 105)
= 18.(-100)
= -1800
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45 + 6| x - 56 | = 105
6 | x - 56 | = 105 - 45
6 | x - 56 | = 60
| x - 56 | = 60 : 6
| x - 56 | = 10
\(\Rightarrow\orbr{\begin{cases}x-56=10\\x-56=-10\end{cases}\Rightarrow\orbr{\begin{cases}x=66\\x=46\end{cases}}}\)
45+6./x-56/=105
=6./x-56/=105-45
=6./x-56/=60
=/x-56/=60:6
=/x-56/=10
=>x-56=10
x-56=-10
=>x=10+56
x=(-10)+56
=>x=66
x=46