1:5×76
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\(76.5+76+76+76.3\)
\(=76.5+76.2+76.3\)
\(=76.\left(5+2+3\right)\)
\(=76.10\)
\(=760\)
học vui ĐẶNG PHƯƠNG THẢO
76 x 5 + 76 + 76 + 76 x 3
= 76 x ( 5 +1+1+3)
=76 x 10
=760
a) - 2 3 .125.32. ( − 76 ) > 0 12.74 . - 3 4 . ( − 395 ) < 0 ⇒ ( − 2 ) 3 .125.32. ( − 76 ) > 12.74. ( − 3 ) 4 . ( − 395 )
b) ( − 1 ) . ( − 2 ) . ( − 3 ) ... ( − 20 ) > 0 ( − 3 ) . ( − 4 ) . ( − 5 ) ... ( − 23 ) < 0 ⇒ ( − 1 ) . ( − 2 ) . ( − 3 ) ... ( − 20 ) > ( − 3 ) . ( − 4 ) . ( − 5 ) ... ( − 23 )
\(\left(x+4\right)\left(x-4\right)+76=\left(2x-1\right)\left(x-4\right)+\left(3x-1\right)\left(x+4\right)\\ \Leftrightarrow x^2-16+76=2x^2-x-8x+4+3x^2-x+12x-4\\ \Leftrightarrow x^2+60=5x^2+2x\\ \Leftrightarrow-4x^2-2x+60=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1+\sqrt{241}}{4}\\x=\dfrac{-1-\sqrt{241}}{4}\end{matrix}\right.\)
a) \(3\dfrac{4}{5}:\dfrac{8}{5}=0,25:x\)
\(\Rightarrow\dfrac{19}{5}.\dfrac{5}{8}=\dfrac{x}{4}\)
\(\Rightarrow\dfrac{x}{4}=2\Rightarrow x=8\)
b) \(2x+\dfrac{3}{24}=3x-\dfrac{1}{32}\)
\(\Rightarrow x=\dfrac{1}{8}+\dfrac{1}{32}=\dfrac{5}{32}\)
c) \(\dfrac{13x-2}{2x+5}=\dfrac{76}{17}\)
\(\Rightarrow221x-34=152x+380\)
\(\Rightarrow69x=414\Rightarrow x=6\)
(3x-1)4-5=76
=> (3x-1)4=76+5
=> (3x-1)4=81
=> (3x-1)4=34
=> 3x-1=3
=> 3x=3+1
=> 3x=4
=> x=\(\frac{4}{3}\)
15,2
15.2