a)      \(4590\div\left(x-24+14\right)=30\)

\(\Leftrightarrow\)\(x-10=4590\div30=153\)

\(\Leftrightarrow\)\(x=153+10=163\)

Vậy....

b)     \(61\times\left(126\div x\right)=1281\)

\(\Leftrightarrow\)\(126\div x=1281\div61=21\)

\(\Leftrightarrow\)\(x=126\div21=6\)

Vậy....

a, 4590:(x-24+14)=30

    x-24+14=4590 : 30

    x-24+14=153

    x-24=153-14

    x-24=139

    x=139+24

    x=163

phần b mik ko bt

\(4590\div\left(x-24+14\right)=30\)

\(x-10=4590\div30\)

\(x-10=153\)

\(x=153+10\)

\(x=163\)

Vậy \(x=163\)

a) \(4590:\left(x-24+14\right)=30\)
\(x-24+14=4590:30\)
\(x-24+14=153\)
\(x-24=153-14\)
\(x-24=139\)
\(x=139+24\)
\(x=163\)
b) \(61\times\left(126:x\right)=1281\)
\(126:x=1281:61\)
\(126:x=21\)
\(x=126:21\)
\(x=6\)

b. 61 × ( 126 : x ) = 1281

x = 126 : x = 1281 ÷ 61 = 21

 x = 126÷21

x = 6

a) 4590 ÷ ( x− 24 + 14 ) = 30

4590 ( x- 10 ) = 30

x - 10 = 4590 : 30

x-10 = 153

x = 153+10

x = 163

\(24+x=30\Rightarrow x=6\)

\(15+x=20\)

\(\Rightarrow x=5\)

\(12+1=14-x\)

\(\Rightarrow13=14-x\Rightarrow x=1\)

24 + x =30=>x=30-24=6

15 + x = 20=>x=20-15=5

12 + 1 = 14 - x=>=13=14-x

=>x=14-13

=>x=1

24 + x = 30

x = 30 - 24

x = 6

15 + x = 20

x = 20 - 15

x = 5

12 + 1 = 14 - x

13 = 14 - x

x = 14 - 13

x = 1

1a) 25 .8 - 12.5 + 272 :17 - 8

= 200 -  60 + 16 - 8

= 140+16-8

= 156 - 8

= 148

b) 125: 25 +14 - 142 : 71

= 5 + 14 - 2 

= 19 - 2 = 17

c) 13. 17 - 256: 16 + 14 : 7 - 1

= 221 - 16 + 2 - 1 

= 205 + 2 - 1 

= 207 - 1 = 206

d) 15 . 24 - 14 . 5 (145 : 5 - 27)

= 360 - 70 (29- 27)

= 360 - 70 . 2

= 360 - 140

= 220

2a) 37 + x = 55

               x= 55 - 37

               x = 18

b) x- 31 = 24

     x       = 24 + 31

     x        = 55

c) 21 (x-11) = 21

        x - 11   = 21 : 21

          x        = 1 +11

           x       = 12

d ) 9. (x - 29)= 0

           x - 29 = 0 :9

             x       = 29

e) (x - 1954) . 5 = 50

         x - 1954   = 50 : 5

          x             = 1964

f ) 30 . 60 - x = 30

        1800 - x   = 30

             x        = 1800 - 30

             x        = 1770

Viết mỏi tay quá huhuh

Cảm ơn nghen

thanks bn nhé

Bài 2 : Tính nhanh
16 x 48 + 8 x 48 + 16 x 28 
= 16 x 48 + 8 x 2 x 24 + 16 x 28 
= 16 x 48 + 16 x 24 + 16 x 28 
= 16 x ( 48 + 24 + 28) 
= 16 x 100 
= 1600
Tick mình nha

4590:(x-24+14)=30

x-24+14=4590:30

x-24+14=153

x-24=153-14

x-24=139

x=139+24

x=16

16x48+8x48+16x28

=16x48+16x24+16x28

=16x(48+24+28)

=16x100

=1600

tick mình nha

giúp mik với

a) x\(\in\){1;2;3;4;6;12}
b) x\(\in\){4;8;16}