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2. tìm số tự nhiên x , biết
A. 3x - 14 = 25 : 23
3x - 14 = 25-3
3x-14 = 22
3x - 14 = 4
3x = 4 + 14
3x = 18
x = 18: 3
x = 6
B. 150 - 2 . ( x + 2 ) = 4 . 22
150 - 2 ( x + 2 ) = 22 . 22
150 - 2 (x + 2) = 22+2
150 - 2 (x+2 ) = 24
150-2 (x+2 ) = 16
2 ( x+2 ) = 150 - 16
2 (x+2) = 134
x+2 = 134 : 2
x +2 =67
x = 65
4. so sánh 5 200 và 2 500
\(2^{500}=\left(2^5\right)^{100}=23^{100}\)
\(5^{200}=\left(5^2\right)^{100}=25^{100}\)
Vì \(23< 25\) nên:
\(\Rightarrow23^{100}< 25^{100}\)
Vậy : \(5^{200}>2^{500}\)
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a) \(-2011-\left(200-2011\right)\)
\(=-2011-200+2011\)
\(=\left(-2011+2011\right)-200\)
\(=0-200\)
\(=-200\)
b) \(\left(-2\right)^2-\left(-2000\right)^0+\left(-1\right)^{2018}-\left|-20\right|\)
\(=4-1+1-20\)
\(=4-20\)
\(=-16\)
Bài 1 :
\(a)-2011-(200-2011)\)
\(=-2011-(200+2011)\)
\(=(-2011+2011)-200\)
\(=0-200=-200\)
\(b)(-2)^2-(-2000)^0+(-1)^{2018}-\left|-20\right|\)
\(=4-1+1-20\)
\(=4-20=-16\)
\(c)23\cdot18-23\cdot26+(-23)\cdot2\)
\(=23\cdot(18-26)+-(23\cdot2)\)
\(=23\cdot(-8)+(-46)\)
\(=-230\)
Bài 2 : Tìm số nguyên x biết :
\(a)3x-(-5)=20\)
\(\Rightarrow3x+5=20\)
\(\Rightarrow3x=20-5\)
\(\Rightarrow3x=15\Rightarrow x=5\)
\(b)3(x+2)=-4+(-2)^3\)
\(\Rightarrow3(x+2)=-4+(-8)\)
\(\Rightarrow3(x+2)=-12\)
\(\Rightarrow x+2=-12\div3\)
\(\Rightarrow x+2=-4\)
Tự tìm x câu b, và câu c,
Bài 3 tự làm
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dễ mà
1)=56
2)=75
3)=33
4)x=3
các bạn cho mk vài li-ke cho tròn 800 với
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\(=>2\cdot4^x+64\cdot4^x=1056\)
\(=>4^x\cdot\left(2+64\right)=1056\)
\(=>4^x=1056:66=16\)
\(=>4^x=4^2\)
\(=>x=2\)
ti ck nha
2.22x + 43.4x = 1056
=> 2.4x + 43.4x = 1056
=> (2 + 64).4x = 1056
=> 66.4x = 1056
=> 4x = 1056 : 66
=> 4x = 16
=> 4x = 42
=> x = 2
7.4x - 1 + 4x + 1 = 23
=> 7.4x.1/4 + 4x.4 = 23
=> (7/4 + 4).4x = 23
=> 23/4.4x = 23
=> 4x = 23 : 23/4
=> 4x = 4
=> x = 1
3x + 2 - 5.3x = 36
=> 3x.9 - 5.3x = 36
=> 3x.(9 - 5) = 36
=> 3x.4 = 36
=> 3x = 36 : 4
=> 3x = 9 = 32
=> 3x = 2
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Câu 2
a)
\(135-5\left(x-29\right)=60\)
\(\Leftrightarrow135-5x+145=60\)
\(\Leftrightarrow5x=210\)
\(\Leftrightarrow x=42\)
Vậy x = 42
b)
\(12x-33=3^2.3^3\)
\(\Leftrightarrow12x=3^5+33\)
\(\Leftrightarrow12x=276\)
\(\Leftrightarrow x=23\)
Vậy x = 23
d)
\(5.2^x-17=23\)
\(\Leftrightarrow5.2^x=40\)
\(\Leftrightarrow2^x=8\)
\(\Leftrightarrow x=3\)
Vậy x = 3
Bài 1:
\(5^4.5=5^5\)
Từ đó ta chọn phương án C.\(5^5\)
Bài 2:
a, 135 - 5( x - 29 ) = 60
\(\Rightarrow\) 5( x - 29 ) = 75
\(\Rightarrow\) x - 29 = 15
\(\Rightarrow\) x = 44
Vậy x = 44
b) 12 . x - 33 = \(3^2.3^3\)
\(\Rightarrow\) 12 . x - 33 = 243
\(\Rightarrow\) 12 . x = 276
\(\Rightarrow\) x = 23
Vậy x = 23
c) \(5.2^x-17=23\)
\(\Rightarrow5.2^x=40\)
\(\Rightarrow2^x=8\)
\(\Rightarrow2^x=2^3\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
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2.
a) 4x + 1 = 65
4x = 64
=> 4x = 43
=> x = 3
b) x3 - 1 = 26
x3 = 27
=> x3 = 33
=> x = 3
c) (x + 1) 3 :3 = 9
(x + 1) 3 = 27
(x + 1) 3 = 33
=> x + 1 = 3
x = 4