e xin tra loi phep tinh nay 123*456+567=56655

tic cho e nha

kết quả là 56655 nha

Bài 6:

\(21,251+6,058+0,749+1,042\)

\(=\left(21,251+0,749\right)+\left(6,058+1,042\right)\)

\(=22+7,1\)

\(=29,1\)

___________________

\(1,53+5,309+12,47+5,691\)

\(=\left(1,53+12,47\right)+\left(5,309+5,691\right)\)

\(=14+11\)

\(=25\)

5:

a: =>x/17=5/17

=>x=5

b; =>6+x=7/11*33=21

=>x=15

c: \(\dfrac{12+x}{43-x}=\dfrac{2}{3}\)

=>3x+36=86-2x

=>5x=50

=>x=10

d: \(\dfrac{x}{5}< \dfrac{3}{7}\)

=>x<3/7*5

=>x<15/7

f: 15/26+x/16=46/52

=>x/16=23/26-15/26=8/26=4/13

=>x=4/13*16=64/13

thay x = 122 vào biểu thức A(x) = x⁴ - 123x³ + 123x² - 123x + 125 ta có :

A(x) = 122⁴ - 123.122³ + 123.122² - 123.122 + 125

= 221533456 - 223349304 + 1830732 - 15006 + 125

= 3

a) \(???\)

b) \(123x+877x=2000\)

     \(1000x=2000\)

      \(x=2000:1000\)

      \(x=2\)

c) \(2x.\left(x-10\right)=0\)

    => \(x-10=0\)

         \(x=10\)

d)\(6.\left(x+2\right)-\left(4x+10\right)=100\)

    \(6.x+12-4x+10=100\)

     \(2x+2=100\)

     \(2x=98\)

     \(x=98:2\)

     \(x=49\)

e) \(x.\left(x+1\right)=2+4+6+8+...+2500\)

     \(x.\left(x+1\right)=1563750\)

      mà ta thấy : \(1250.1251=1563750\)

=> \(x=1250\)

g)\(\left(x+1\right)+\left(x+2\right)+...+\left(x+100\right)=5750\)

     \(x.100+5050=5750\)

     \(x.100=5750-5050\)

     \(x.100=700\)

     \(x=7\)

a) x = 5810

b) x = 4088

c) x = 15072

a) x - 1234 = 4567

              x = 4567+1234

              x = 5801

b) x + 453 = 4541

             x = 4541 - 453

             x = 4088

c) x : 1256 = 12

            x   = 12 x 1256

             x  = 15 072

123x=123(triet tieu 123123)

Vay x= 1

1001x112x123x=1001x123.x123

=> 112x=123 => x=123/112