24 x 35 + 84 : 2 = ??
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Y - 3/12=35/84
Y - 1/4 = 5/12
Y = 5/12 +1/4
Y= 5/12 + 3/12
Y= 8/12
Y= 2/3
\(Y-\frac{3}{12}=\frac{35}{84}\)
\(Y-\frac{1}{4}=\frac{35}{84}\)
\(Y-\frac{1}{4}=\frac{5}{12}\)
\(Y=\frac{5}{12}+\frac{1}{4}\)
\(Y=\frac{5\times1+1\times3}{12}\)
\(Y=\frac{5+3}{12}\)
\(Y=\frac{8}{12}\)
\(Y=\frac{2}{3}\)
a, \(\dfrac{1}{2}\) - ( - \(\dfrac{1}{3}\) ) + \(\dfrac{1}{23}\) + \(\dfrac{1}{6}\)
= \(\dfrac{5}{6}\) + \(\dfrac{1}{23}\) + \(\dfrac{1}{6}\)
= 1 + \(\dfrac{1}{23}\)
= \(\dfrac{24}{23}\)
b, \(\dfrac{11}{24}\) - \(\dfrac{5}{41}\) + \(\dfrac{13}{24}\) + 0,5 - \(\dfrac{36}{41}\)
= (\(\dfrac{11}{24}\) + \(\dfrac{13}{24}\)) - ( \(\dfrac{5}{41}\) + \(\dfrac{36}{41}\)) + 0,5
= 1 - 1 + 0,5
= 0,5
c,\(-\dfrac{1}{12}-\left(\dfrac{1}{6}-\dfrac{1}{4}\right)\)
=\(-\dfrac{1}{12}-\left(-\dfrac{1}{12}\right)\)
=0
d, \(\dfrac{1}{6}-\left[\dfrac{1}{6}-\left(\dfrac{1}{4}+\dfrac{9}{12}\right)\right]\)
= \(\dfrac{1}{6}-\left[\dfrac{1}{6}-1\right]\)
= \(\dfrac{1}{6}-\left(-\dfrac{5}{6}\right)\)
= 1
a, (-25) + 276 - (276 - 25)
= (-25) + 276 - 276 + 25
= [ (-25) + 25] - (276 - 276)
= 0 - 0
= 0
b, 24 x 46 + 24 x 53 + 24
= 24 x ( 46 + 53 + 1)
= 24 x 100
= 2400
\(4^3\times27-4^3\times23\)
\(=4^3\times\left(27-23\right)\)
\(=64\times4\)
\(=256\)
\(3^4\times71+3^4\times2^9\)
\(=3^4\times\left(71+2^9\right)\)
\(=81\times\left(71+512\right)\)
\(=81\times583\)
\(=47223\)
\(\left(3^3\times5^2-2^4-16\right)\times13\)
\(=\left(27\times25-16-16\right)\times13\)
\(=\left(675-16-16\right)\times13\)
\(=\left(659-16\right)\times13\)
\(=643\times13\)
\(=8359\)
\(35\times273+33\times35\)
\(=35\times\left(273+33\right)\)
\(=35\times306\)
\(=10710\)
\(2^3\times4^2+2^3\times84-40\)
\(=8\times16+8\times84-40\)
\(=8\times\left(16+84\right)-40\)
\(=8\times100-40\)
\(=800-40\)
\(=760\)
\(\left(-35\right)+\left(-68\right)+\left(-65\right)=2+\left(-68\right)\\ =-\left(35+65\right)-\left(68.2\right)+2\\ =-100-136+2\\ =-236+2=-234\)
(-35) +(-68) + (-65) + 2 + (-68)
= -35 - 68 - 65 + 2 - 68
= -(35 + 65) - (68 + 68) + 2
= - 100 - 136 + 2
= -236 + 2
= -234
\(x^2-5x-84=0\)
=> \(x^2-5x=84\)=> x(x-5)=84
=> \(\orbr{\begin{cases}x=84\\x-5=1\Rightarrow x=6\end{cases}}\); \(\orbr{\begin{cases}x=1\\x-5=84\Rightarrow x=89\end{cases}}\)
=> \(\orbr{\begin{cases}x=-84\\x-5=-1\Rightarrow x=4\end{cases}}\); \(\orbr{\begin{cases}x=-1\\x-5=-84\Rightarrow x=-79\end{cases}}\)
vậy x\(\in\)\((\)84, 6, 1, 89, -84, 4, -1, -79)
\(24x35+84:2\)
\(=840+42\)
\(=882\)
\(\text{Hok tốt!}\)
\(\text{@Kaito Kid}\)
=882 nha
HT