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a, 36:(x–5) = 2 2
(x–5) = 9
x = 14
b, [3.(70–x)+5]:2 = 46
[3.(70–x)+5] = 92
70–x = 29
x = 41
c, 450:[41–(2x–5)] = 3 2 .5
41–(2x–5) = 10
2x–5 = 31
2x = 36
x = 18
d, 230+[ 2 4 +(x–5)] = 315. 2018 0
16+(x–5) = 315–230
x–5 = 85–16
x = 69+5
x = 74
e, 2 x + 2 x + 1 = 48
2 x .(2+1) = 48
2 x = 16 = 2 4
x = 4
f, 3 x + 2 + 3 x = 2430
3 x . 3 2 + 1 = 2430
3 x = 2430:10 = 243 = 3 5
x = 5
1:
a: \(35\cdot16+35\cdot28-44\cdot15\)
\(=35\left(16+28\right)-44\cdot15\)
\(=44\left(35-15\right)\)
\(=44\cdot20=880\)
b: \(240-2\left(3\cdot5^2-20:2^2\right)\)
\(=240-2\left(3\cdot25-20:4\right)\)
\(=240-150+10=10+90=100\)
2:
b: \(\left(8-3x\right)^4-1=15\)
=>\(\left(3x-8\right)^4=16\)
=>\(\left[{}\begin{matrix}3x-8=2\\3x-8=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}3x=10\\3x=6\end{matrix}\right.\)
=>x=10/3 hoặc x=2
c: \(218-5\left(x-8\right)=2^5:2^2\)
=>\(218-5\left(x-8\right)=2^3=8\)
=>5(x-8)=210
=>x-8=42
=>x=50
d: \(\left(5-3x\right)^4-1=15\)
=>\(\left(3x-5\right)^4-1=15\)
=>\(\left(3x-5\right)^4=16\)
=>\(\left[{}\begin{matrix}3x-5=-4\\3x-5=4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}3x=1\\3x=9\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=3\end{matrix}\right.\)
( -12 + 22 ) + ( 5 - 15 )
= 10 - 10
= 0
( x - 3 ) . 5 + 2 . 2 . 2 . 2 = 36
( x - 3 ) . 5 + 16 = 36
( x - 3 ) . 5 = 20
( x - 3 ) = 20 : 5
( x - 3 ) = 4
x = 7
Vậy x = 7
a, (2\(x\) -5) + 17 = 6
2\(x\) - 5 = 6 - 17
2\(x\) - 5 = - 11
2\(x\) = - 11 + 5
2\(x\) = -6
\(x\) = -3
b, (-18).\(x\) = - 36
\(x\) = -36 : (-18)
\(x\) = 2
c, 15 - (-11\(x\) - 7) = -22
- 11\(x\) - 7 = 15 + 22
-11\(x\) - 7 = 37
11\(x\) = -37 - 7
11\(x\) = - 44
\(x\) = - 4
a) \(\left(2x-5\right)+17=6\Rightarrow2x-5=-11\Rightarrow2x=-6\Rightarrow x=-3\)
b) \(\left(-18\right)x=-36\Rightarrow x=\left(-36\right):\left(-18\right)=2\)
c) \(15-\left(-11x-7\right)=-22\)
\(\Rightarrow15+11x+7=-22\)
\(\Rightarrow11x=-22-7-15\)
\(\Rightarrow11x=-44\)
\(\Rightarrow x=-44:11=-4\)
1
= 25 * ( - 21 ) + 25 * 72 + 49 * 25
= 25 * ( -21 + 72 + 49 )
= 25 * 100 = 2500
2
= 16 * 2 * (-39) + 16 * 2*11
= 16 * 2 * (-39+ 11)
= 32 * (-28) = (-896)
3
= 22 * 2 * ( - 36 ) + 22 * ( - 28 )
= 22 * {( 2 * [( - 36 ) + ( - 28 )]}
= 22 * ( - 100 )
= ( -2200 )
4
=> x - 2 = 3 hoặc ( - 3 )
Nếu x - 2 = 3
=> x = 5
Nếu x - 2 = ( - 3 )
=> x = -1
Vậy x = 5 hoặc x = -1
5
=> |x - 3 | = 13 + 7
=> |x - 3 | = 20
=> x - 3 = 20 hoặc ( -20 )
Nếu x - 3 = 20
=> x = 23
Nếu x - 3 = ( - 20 )
=> x = -17
Vậy x = 23 hoặc x = - 17
a)19 x (28 - 3) / 5x (3+35 )
= 19 x 25 /5 x 38
= 475/190
= 5/2
còn mấy ý kia chung j đặt đấy nhé mik hơi lười
\(\Rightarrow2\left(x-5\right)=14\\ \Rightarrow x-5=7\\ \Rightarrow x=12\)
12