\(2^4.x-3.5x=5^2-2^4\)

\(x\left(16-15\right)=25-16\)

\(x=9\)

\(24.17+52.76+24.35\)

\(=24.\left(17+35\right)+52.76\)

\(=24.52+52.76\)

\(=52.\left(76+24\right)\)

\(=52.100\)

\(=5200\)

   24 x 17 + 52 x 76 + 24 x 35

= 24 x ( 17 + 35 ) + 52 x 76

= 24 x 52 + 52 x 76

= 52 x ( 24 + 76 )

= 52 x 100

= 5200

         ~~~~~~~~~~Hok tốt~~~~~~~~~~

  24 x 17 + 52 x 76 + 24 x 35 

=24 x 17 + 52 x 3 x 24 + 24 x 35

=24 x 17 + 156 x 24 + 24 x 35

=24 x (17 + 156 + 35)

=24 x 208

=4932

đó là cách nhanh nhất

chịu

   \(15,4\) x \(52\) \(+30,8\) x \(24\)

\(=800,8\)\(+30,8\) x \(24\)

\(=800,8+739,2\)

\(=1540\)

15,4 x 52+ 30,8 x 24  
800,8 + 739,2 = 1540

ai rảnh trả lời hộ mik đc 0 ạ ?

t ko bt làm luôn nèk =)))

\(=47-\left[\dfrac{\left(45\cdot16-25\cdot12\right)}{14}\right]\)

=47-420/14

=47-30

=17

Đáp số:

a) x=15

b) x=11

c) x=68

d) x=310

(x-3.5).12=0

X-15        =0+15

     x         =15

24 x 125 + 52 x 25=4300

(24*125)+(52*25)=4300

Ta có: 24 x 125 + 52 x 25 = 3000 + 1300 = 4300

Pài này dễ mà, tịc nha!!***

12 x 50 + 8 x 27 + 6 x 52 + 24 x 53

= 24 x 25 + 24 x 9 + 24 x 13 + 24 x 53

= 24 x ( 25 + 9 + 13 + 53 )

=24 x100

= 2400

12 x 50 + 8 x 27 + 6 x 52 + 24 x 53 

=24 x 25 + 24 x 9 +24 x 13 + 24 x 53

=24 x(25 + 9 + 13 + 53)

=24x100

=2400

Bài 2:

a. $=58(75+50-25)=58.100=5800$
b. $=27.8+4.9-5=216+36-5=247$

Bài 3:

a. 

$(x-38):16=12$

$x-38=16\times 12=192$
$x=192+38 = 230$
b.

$10+2x=4^5:4^3=4^2=16$

$2x=16-10=6$

$x=6:2=3$
c.

$440+2(125-x)=546$

$2(125-x)=546-440=106$

$125-x=106:2=53$

$x=125-53=72$

d.

$(x-15):5+20=22$
$(x-15):5=22-20=2$

$x-15=2\times 5=10$

$x=10+15=25$

e.

$2x-138=2^3.3^2=8.9=72$

$2x=72+138 = 210$

$x=210:2=105$

Bài 3:

f.

$2.3^x-5=7^2$

$2.3^x=7^2+5=54$
$3^x=54:2=27=3^3$

$\Rightarrow x=3$

g.

$7x-3^3=2^7:2^4$

$7x-27=2^3=8$

$7x=27+8=35$

$x=35:7=5$
h.

$427-(x+100)=227$

$x+100=427-227 = 200$

$x=200-100=100$

i.

$2x-138=2^3.3^2=8.9=72$
$2x=72+138 = 210$

$x=210:2=105$

k.

$(6x-18):3+25.2=78$

$(2x-6)+50=78$

$2x-6=78-50=28$

$2x=28+6=34$

$x=34:2=17$

16 x 3 x 21 + 24 x 2 x 52 + 12 x 4 x 27

= 48 x 21 + 48 x 52 + 48 x 27

= 48 x ( 21 + 52 + 27 )

= 48 x 100

= 4800

16 x 3 x 21 + 24 x 2 x 52 + 12 x 4 x 27

=48*21+48*52+48*27

=48*(21+52+27)

=48*100

=4800

   16 x 3 x 21 + 24 x 2 x 52 + 12 x 4 x 27

= 48 x 21 + 48 x 52  + 48 x 27

= 48 x ( 21 + 52 + 27)

= 48 x 100

= 4800