12x23+12x24+12x45=12x(23+34+45)=1224

1224 nha

= 12 x ( 23 + 34 + 45 ) = 12 x 102  = 12 x ( 100 + 2 ) = 12 x 100 + 12 x 2 = 1200 + 24 = 1224

a) 12+x=34

          x=34-12

          x=22

b) 23+x=34

         x=34-23

         x=11

c)45+34=79

a, 12 + x = 34

x = 34 - 12

x = 22

b, 23 + x = 34

x = 34 - 23

x = 11

c, 45 + 34 = x 

x = 79

a) 12+x=34

           x=34-12

           x=22

b) 23+x=34

           x=34-23

           x=11

c) 45+23=x

    68=x

    x=68

1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0

1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0

Đây nha

a)

4 5 . x = 4 7      x   =   4 7 : 4 5      x   =   4 7 . 5 4      x = 5 7

b) 

3 4 : x = 1 2        x   =   3 4 : 1 2        x = 3 4 .2        x = 3 2

c) 

x : 8 11 = 11 3 x            =   11 3 . 8 11 x            =   8 3

a ) x = − 4 5 − 1 2   ⇔   x = − 13 10 b ) x = − 3 4 − 2 3 ⇔ x = − 17 12 c ) − 3 5 : x = − 2 3 − 2 3 5 ⇔ − 3 5 : x = − 49 15 ⇔ x = − 3 5 : − 49 15 ⇔ x = 9 49  

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x=-538

a, x=45-12 =33

b, x=56-34=22

kb nha

a ) x + 12 = 45

     x         = 45 - 12

     x         = 33

b ) x + 34 = 56

     x         = 56 - 34

     x          = 22

a, \(x+12=45\)  

    \(x=45-12\)

    \(x=33\)

b, \(x+34=56\)

    \(x=56-34\)

    \(x=22\)

a.1872

b.3676

2 tui cũng là army yiu bts nhìu 

----jung hosoek---

a) 12 x 13 + 12 x 49 + 12 x 14 +14 x 78 = 1873

b) 34 x 34 + 56 x 45 = 3676

\(1.\text{ Tính : }\)

\(a,\text{ }12\text{ x }13+12\text{ x }49+12\text{ x }14+14\text{ x }78\)

\(=12\text{ x }\left(13+49\right)+14\text{ x }\left(12+78\right)\)

\(=12\text{ x }62+14\text{ x }90\)

\(=744+1260\)

\(=2004\)

\(b,\text{ }34\text{ x }34+56\text{ x }45\)

\(=1156+2520\)

\(=3676\)     

Ta có:

=\(\dfrac{6x45x11x17}{15x12x34x33}\)

= \(\dfrac{6x15x3x11x17}{15x6x2x17x2x11x3}\)

= \(\dfrac{1}{2x2}\)

=\(\dfrac{1}{4}\)

Những chữ x ở trên là dấu nhân nhé