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24 + 3 x (5 - x) = 27
27 x (5 - x) = 27
5 - x = 27 : 27
5 - x = 1
x = 5 - 1
x = 4
24 + 3. ( 5 - x ) = 27
3 . ( 5 - x ) = 27 - 24
3 . ( 5 - x ) = 3
5 - x = 3 : 3
5 - x = 1
x = 5 - 1
x = 4
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\(2^{x-1}=16\)
\(\Leftrightarrow2^{x-1}=2^4\)
\(\Leftrightarrow x-1=4\)
\(\Leftrightarrow x=5\)
Vậy x=5
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Ko sai đâu nhé bn đề trong sách mà mik ko chép sai đâu (^_^)
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A=\(\frac{2.6.10+6.10.14+...+194+198+202}{1.3.5+3.5.7+...+97.99.101}\)\(=\frac{2.2.2\left(1.3.5\right)+2.2.2\left(3.5.7\right)+...+2.2.2\left(97.99.101\right)}{1.3.5+3.5.7+...+97.99.101}\)
\(=\frac{2.2.2\left(1.3.5+3.5.7+...+97.99.101\right)}{1.3.5+3.5.7+...+97.99.101}\)\(=\frac{2.2.2}{1}=8\)
(2 + x ) : 5 = 6
2 + x = 6 . 5
2 + x= 30
x = 30 -2
x = 28
x = 28 nha