bài 26: tìm xEz
a)56-(x+5):2=40
b)|x+2|=33
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a) 17 + x=13
=> x=17-13
=> x=4
b) x-25=-18
=>x=-18+25
=>x=7
c) -32-x=-36
=>x=36-32
=> x=4
d) x+78=-56
=> x=-56-78
x=-134
a) \(17+x=13\)
\(\Rightarrow x=13-17\)
\(\Rightarrow x=-4\)
Vậy x = -4
b) \(x-25=-18\)
\(\Rightarrow x=-18+25\)
\(\Rightarrow x=7\) _ Vậy x = 7
c) \(-32-x=-36\)
\(\Rightarrow x=-32-\left(-36\right)\)
\(\Rightarrow x=4\)_Vậy x = 4
d) \(x+78=-56\)
\(\Rightarrow x=-56-78\)
\(\Rightarrow x=-134\)
Vậy x = -134
\(1,\Leftrightarrow7x=42\Leftrightarrow x=6\\ 2,\Leftrightarrow36-4x=4\Leftrightarrow4x=32\Leftrightarrow x=8\\ 3,\Leftrightarrow3x=35\Leftrightarrow x=\dfrac{35}{3}\\ 4,\Leftrightarrow x-12=144\Leftrightarrow x=156\\ 5,\Leftrightarrow x-14=16\Leftrightarrow x=30\\ 6,\Leftrightarrow3x-24=\dfrac{148}{73}\Leftrightarrow3x=\dfrac{1900}{73}\Leftrightarrow x=\dfrac{1900}{219}\\ 7,\Leftrightarrow33+x=45\Leftrightarrow x=12\\ 8,Sai.đề\\ 9,\Leftrightarrow\left(x+9\right):2=39\Leftrightarrow x+9=78\Leftrightarrow x=69\\ 11,\Leftrightarrow2\left(x+7\right)=38\Leftrightarrow x+7=19\Leftrightarrow x=12\\ 13,\Leftrightarrow2\left(x-51\right)=66\Leftrightarrow x-51=33\Leftrightarrow x=84\)
\(15,\Leftrightarrow x-19=9\Leftrightarrow x=28\\ 17,\Leftrightarrow\left(x-3\right):2=48\Leftrightarrow x-3=96\Leftrightarrow x=99\\ 19,\Leftrightarrow0x=46\Leftrightarrow x\in\varnothing\\ 8,Sai.đề\\ 14,\Leftrightarrow2x=209\Leftrightarrow x=\dfrac{209}{2}\\ 16,\Leftrightarrow2x+6=157\Leftrightarrow2x=151\Leftrightarrow x=\dfrac{151}{2}\\ 18,\Leftrightarrow5\left(x+4\right)=100\Leftrightarrow x+4=20\Leftrightarrow x=16\\ 20,\Leftrightarrow\left(3x-5\right)^3=27=3^3\Leftrightarrow3x-5=3\Leftrightarrow x=\dfrac{8}{3}\)
1, <=>33+x=45
<=> x = 12
Vậy x=12
2, <=>x+73 =102
<=> x =29
3,x=2
4, -23+x=25<=>x=2
6, x-8=20<=>x=28
a: \(8x\left(2023+x\right)-8x\left(x+2024\right)=56\)
=>\(8x\left(x+2023-x-2024\right)=56\)
=>-8x=56
=>\(x=\frac{56}{-8}=-7\) (nhận)
b: \(5-2025x=9-2026\left(x-1\right)\)
=>-2025x+5=9-2026x+2026
=>-2025x+5=-2026x+2035
=>x=2035-5=2030(nhận)
c: \(\left(-12\right)^2\cdot x=56+10\cdot13x\)
=>144x=56+130x
=>14x=56
=>x=4(nhận)
d: -(x-32+11)=(21-33-x+7)
=>-(x-21)=(-x-5)
=>-x+21=-x-5
=>21=-5(vô lý)
=>x∈∅
e: \(-2\left(x+6\right)+6\left(x+10\right)=8\)
=>-2x-12+6x+60=8
=>4x+52=8
=>4x=8-52=-44
=>\(x=-\frac{44}{4}=-11\) (nhận)
47. (23 + 50)- 23. ( 47+50 )
= 47. 23+ 47. 50- 23. 47 - 23. 50
=47. 50 - 23. 50
= 50 .( 47 -23)
=50. 24 = 1200
1/
a, xem lại đề
b, \(\sqrt{6}+\sqrt{12}+\sqrt{30}+\sqrt{56}< \sqrt{6,25}+\sqrt{12,25}+\sqrt{30,25}+\sqrt{56,26}=2,5+3,5+5,5+7,5=19\)
2/
a, \(\sqrt{26}+\sqrt{17}>\sqrt{25}+\sqrt{16}=5+4=9\)
b, xem lại
4/
\(B=\frac{\sqrt{x}+1}{\sqrt{x}-2}=\frac{\sqrt{x}-2+3}{\sqrt{x}-2}=1+\frac{3}{\sqrt{x}-2}\)
Để \(B\in Z\Leftrightarrow\sqrt{x}-2\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)
Ta có bảng
\(\sqrt{x}-2\) | 1 | -1 | 3 | -3 |
\(\sqrt{x}\) | 3 | 1 | 5 | -1 |
x | loại | 1 | loại | loai |
Vậy...
a) x + 10 = 20
<=> x = 20 - 10 = 10
Vậy x = 10
b) 2x + 15 = 35
<=> 2x = 35 - 15 = 20
<=> x = 10
Vậy x = 10
c) 3(x + 2) = 15
<=> x + 2 = 15 : 3 = 5
<=> x = 5 - 2 = 3
Vậy x = 3
d) 10x + 15.11 = 20.10
<=> 10x + 165 = 200
<=> 10x = 200 - 165 = 35
<=> x = 35 : 10 = 3,5
Vậy x = 3,5
e) 4(x + 2) = 3.4
<=> x + 2 = 3
<=> x = 3 - 2 = 1
Vậy x = 1
f) 33x + 135 = 26.9
<=> 33x + 135 = 234
<=> 33x = 234 - 135 = 99
<=> x = 99 : 33 = 3
Vậy x = 3
g) 2x + 15 + 16 + 17 = 100
<=> 2x + 48 = 100
<=> 2x = 100 - 48 = 52
<=> x = 52 : 2 = 26
Vậy x = 26
h) 2(x + 9 + 10 + 11) = 4.12.5
<=> x + 30 = 120
<=> x = 120 - 30 = 90
Vậy x = 90
a)56-(x+5):2=40
(x+5):2=56-40
(x+5):2=16
x+5=16:2
x+5=8
x=8-5
x=3
Vậy x=3
b)|x+2|=33
|x+2|=27
\(\Rightarrow\orbr{\begin{cases}x+2=27\\x+2=-27\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=27-2=25\\x=-27-2=-29\end{cases}}\)
Vậy x = 25 hoặc x = -29
\(a,56-\left(x+5\right):2=40\)
\(56-\left(x+5\right)=80\)
\(x+5=-24\Leftrightarrow x=-29\)
\(b,|x+2|=3^3\)
\(|x+2|=27\)
\(Th1:x+2=27\Leftrightarrow x=25\)
\(Th2:x+2=-27\Leftrightarrow x=-29\)