a/57x23+23x44-23

57x23+23x44-23x1

=23x(57+44-1)

=23x100

=2300

b

a) 57 . 23 + 23 . 44 - 23

= 57 . 23 + 23 . 44 - 23 . 1

= ( 57 + 44 - 1 ) . 23

= 100 . 23

= 2300

b) 1672 - [ 49 + ( 13 - 7 )³ ]

= 1672 - [ 49 + 6³ ]

= 1672 - [ 49 + 216 ]

= 1672 - 265

= 1407

c) 50 : { 2 . [ 52 - ( 3 . 5 - 2² . 3 )³ ] }

= 50 : { 2 . [ 52 - ( 3 . 5 - 4 . 3 )³ ] }

= 50 : { 2 . [ 52 - ( 3 . 1 )³ ] }

= 50 : { 2 . [ 52 - 27 ] }

= 50 : { 2 . 25 }

= 50 : 50

= 1

d) -2014 + (-999) + 14 + (-2001)

= ( -2014 + 14 ) + [ (-999) + (-2001) ]

= (-2000) + (-3000)

= -5000

Học tốt nhé bạn !

1. Tính:

a) 23 + 24 - ( 65 x 2 - 4 ) x 4 + 66 + 44 - ( 54 : 9 x 9 : 9 + 45 ) : 1 + 1 - 1 x ( 23 + 23 - 23 x 2 +1 ) = 51

b) 4444444444444444444444444444444444444444444444444444444444444444444 : 1

= 4444444444444444444444444444444444444444444444444444444444444444444

c) 3⁰ = 0

d) 1/1 = 1

e)

a) - 530

b) 44444444444444444444444444444444444444444444444444444444444444444444

c) 0

d) 1

e) Em là em

-530

444444444444444444444444444444444444444444444444444444444444444

0

1

...

Gợi ý thui :v

Giải hơi dài dòng :v

\(a,x-\frac{1}{5}=-2\frac{1}{3}\)

\(\Rightarrow x-\frac{1}{5}=-\frac{7}{3}\)

\(\Leftrightarrow x=-\frac{7}{3}+\frac{1}{5}=-\frac{32}{15}\)

\(b,\frac{1}{4}+\frac{3}{4}:x=\frac{1}{2}\)

\(\Rightarrow\frac{3}{4}:x=\frac{1}{2}-\frac{1}{4}\)

\(\Rightarrow\frac{3}{4}x=\frac{1}{4}\Leftrightarrow x=\frac{1}{3}\)

c, Tự làm

a. x - 1/5 = -2 1/3

    x - 1/5 = -7/3

    x         = -2 2/15

b. 1/4 + 3/4 : x = 1/2

             3/4 : x = 1/2 - 1/4

             3/4 : x = 1/4

                     x = 3/4 x 4

                     x = 3

c. -0,75x + 8/11x = 23/44

     (-3/4 + 8/11)x = 23/44

                -1/44x = 23/44

                        x = -23

\(a,x-\frac{1}{5}=-2\frac{1}{3}\)

\(\Rightarrow x-\frac{1}{5}=\frac{-7}{3}\)

\(\Rightarrow x=\frac{-7}{3}+\frac{1}{5}\)

\(\Rightarrow x=\frac{-35}{15}+\frac{3}{15}\)

\(\Rightarrow x=\frac{-32}{15}\)

\(x-\frac{1}{5}=-2\frac{1}{3}\)

\(x-\frac{1}{5}=\frac{-7}{3}\)

\(x=\frac{-7}{3}+\frac{1}{5}\)

\(x=\frac{-32}{15}\)

~ Hok tốt ~

a, x - 1/5= -21/3
x= -21/3 + 1/5
x= -6,8

b, 1/4 + 3/4 :x = 1/2
             3/4 :x = 1/2 - 1/4= 1/4
                    x = 3/4 : 1/4 = 3

c,- 0,75x + 8/11x = 23/44
   x. (-3/4 + 8/11) = 23/44
   x. -1/44= 23/44
   x          = 23/44 : -1/44
   x          = -23

\(\frac{1}{4}+\frac{3}{4}:x=\frac{1}{2}\)

\(\frac{3}{4}:x=\frac{1}{2}-\frac{1}{4}\)

\(\frac{3}{4}:x=\frac{1}{4}\)

\(x=\frac{3}{4}:\frac{1}{4}\)

\(x=3\)

~ Hok tốt ~

tìm x hả bạn

      200-2(x+6)=14

=> 2(x+6)=200-14

=> 2(x+6)=186

 => x+6=186:2

=> x+6=93

=> x=93-6

=> x=87

       3(x+5)+7=64

=>3(x+5)=64-7

=>3(x+5)=57

=>x+5=57:3

=>x+5=19

=>x=19-5

=>x=14

a) ( 1 + 3 + 5 + ....+ 97 + 99 ) - 2 x X = 500 

Áp dụng công thức tính dãy số ta có :

\(1+3+5+...+99=\frac{\left[\left(99-1\right):2+1\right].\left(99+1\right)}{2}=50.100:2=50.50=2500\)

=> 2500 - 2X = 500

=> 2X = 2500 - 500 = 2000

=> X = 2000 : 2 = 1000

a) Ta có : 1 + 3 + 5 + ..... + 97 + 99 

Số số hạng trên là :

 ( 99 - 1 ) : 2 + 1 = 50 số hạng :

 Tổng trên là :

 ( 99 - 1 ) x 50 : 2 = 2450 

Thế vào câu a ta được :

 2450 - 2x = 500

=> 2x = 1950

=> x = 975

b)  X - 1234 = ( 175 x 2 - 50 x 7 ) : 23 + 23 

=> X - 1234 = (350 - 350) : 23 + 23

=> X - 1234 = 0 : 23 + 23

=> X - 1234 = 0 + 23 = 23

=> X = 23 + 1234

=> X = 1257

47. (23 + 50)- 23. ( 47+50 )

= 47. 23+ 47. 50- 23. 47 - 23. 50

=47. 50 - 23. 50

= 50 .( 47 -23)

=50. 24 = 1200

(-33 ). (-5) - 33 . 4 + 33

= 33 ( 5 - 4 + 1)

=33 . 2 = 66

giup minh voi