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a.
\(\left(-12\right).x-4=5^2.\left(-4\right)\)
\(\Leftrightarrow\left(-12\right).x-4=25.\left(-4\right)\)
\(\Leftrightarrow\left(-12\right).x-4=-100\)
\(\Leftrightarrow\left(-12\right).x=4-100\)
\(\Leftrightarrow\left(-12\right).x=-96\)
\(\Leftrightarrow x=\left(-96\right):\left(-12\right)\)
\(\Leftrightarrow x=8\)
b.
\(\left(-2015+184\right)-\left(84-2015\right)+\left(-200\right)\)
\(=\left(-2015+2015\right)+\left(184-84\right)+\left(-200\right)\)
\(=0+100+\left(-200\right)\)
\(=-100\)
a) (-12).x - 4 = 5².(-4)
-12x - 4 = 25.(-4)
-12x - 4 = -100
-12x = -100 + 4
-12x = -96
x = -96 : (-12)
x = 8
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Số số hạng là :
(x - 4) : 1 + 1 = x - 3 (số hạng)
Tổng là ; (x - 3)(x - 1)
<=> (x - 3)(x - 1) = 184
<=> x2 - 4x + 3= 184
=> (x - 2)2 - 1 = 184
=> (x - 2)2 = 185
Sai đề
4+5+6+.......+x=184
(4+x)*x:2 =184
(4+x)*x =368
(4+x)*x = \(\sqrt{368}\)
x =so nguyen trong h vua chia
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bn xem thử đáp án của mik nha
184 + 100 - 84 =(184 - 84)+100 =100 + 100 = 200
Chúc bn học tốt !
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\(ƯC\left(84,180\right)=Ư\left(12\right)=\left\{1;2;3;4;6;12\right\}\\ \Rightarrow x\in\left\{6;12\right\}\)
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\(84=2^2\cdot3\cdot7;180=2^2\cdot3^2\cdot5;240=2^4\cdot3\cdot5\)
=>\(ƯCLN\left(84;180;240\right)=2^2\cdot3=12\)
Ta có: \(84⋮x;180⋮x;240⋮x\)
=>\(x\inƯC\left(84;180;240\right)\)
=>\(x\inƯ\left(12\right)\)
=>\(x\in\left\{1;-1;2;-2;3;-3;4;-4;6;-6;12;-12\right\}\)
mà x>6
nên x=12
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\(\left(x+184-278\right)-\left(184-278\right)=4\\\left(x+184-278\right)-\left(-94\right)=4\\ \left(x+184-278\right)+94= 4\\ \left(x+184-278\right)= 4-94\\ \left(x+184-278\right)=-90\\ x+184=-90+278\\ x+184=188\\ x=188-184\\ 4.\)
( x + 184 - 278 ) - ( 184 - 278 ) = 4
x + 184 - 278 - 184 + 278 = 4
x + 0 = 4
x = 4
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