98(tích nhà các bạn)

\(y=\frac{1}{x^2+\sqrt{x}}\)

cau nham roi phai la 4234341-x=4214 chu

a là cái gì?

   49 x 77 - 30² + 23 x 49 

=49x(77+23)-30² 

=49x100-900

=4900-900

=4000

a là câu a bạn nhé 

còn câu b,

217 + [ 579 + ( -117) + (-79)]

giải hộ mk

a: \(2\left(x-51\right)=2\cdot2^3+20\)

=>\(2\left(x-51\right)=2^4+20=36\)

=>x-51=36/2=18

=>x=18+51=69

b: \(2x-49=5\cdot3^2\)

=>\(2x-49=5\cdot9=45\)

=>2x=45+49=94

=>x=94/2=47

c: \(\left[\left(8x-12\right):4\right]\cdot3^3=3^6\)

=>\(\left[4\cdot\dfrac{\left(2x-3\right)}{4}\right]=3^3\)

=>\(2x-3=3^3=27\)

=>2x=3+27=30

=>x=30/2=15

d: \(2^{x+1}-2^2=32\)

=>\(2^{x+1}=32+2^2=32+4=36\)

=>\(x+1=log_236\)

=>\(x=log_236-1\)

e: \(\left(x^3-77\right):4=5\)

=>\(x^3-77=20\)

=>\(x^3=77+20=97\)

=>\(x=\sqrt[3]{97}\)

ngu như con lợn lò

5x7x77-7x60+49x25-15x42=2870

thằng hâm

   5 x 7 x 77 - 7 x 60 + 49 x 25 - 15 x 42 

= 7 x 77 x 5 - 7 x 60 + 7 x 7 x 25 - 15 x 6 x 7

= 7 x 385 - 7 x 60 + 7 x 35 - 7 x 90

= 7 x ( 385 - 60 + 35 - 90 )

= 7 x 270

= 1890

6: \(\Leftrightarrow x-8=20\)

hay x=28

   \(\dfrac{11}{4}\) \(\times\) 49 : \(\dfrac{77}{2}\) 

= \(\dfrac{11}{4}\) x 49 x \(\dfrac{2}{77}\) 

=  \(\dfrac{11\times7\times7\times2}{4\times11\times7}\)

= \(\dfrac{7}{2}\)

\(\dfrac{11}{4}.9:\dfrac{77}{2}\)

\(=\dfrac{11}{4}.9.\dfrac{22}{7}\)

\(=\dfrac{11.7.7.2}{4.11.7}\)

\(=\dfrac{7}{2}\)