a,24.57+43.24

=24.(57+43)

=24.100

=2400

b,12.19+12

=12.(19+1)

=12.20

=12.10.2

=120.2

=240

c,43.27+93.43+57.61+59.57

=43.(27+93)+57.(61+59)

=43.120+57.120

=120.(43+57)

=120.100

=12000

d,64.6+81.4+17.6

=64.6+27.3.2.2+17.6

=64.6+54.6+17.6

=(64+54+17).6

=135.6

=810

a) 24 . 57 + 43 . 24

= 24 . (57 + 43)

= 24 . 100

= 2400

b) 12 . 19 + 12

= 12 . (19 + 1)

= 12 . 20

=240

c) 43 . 27 + 93 . 43 + 57 . 61 +59 . 57

= 43 . ( 27 + 93) + 57 . (61 + 59)

= 43 . 120 + 57 . 120

= 120 . (43 + 57)

= 120 . 100

= 12000

\(a,24\cdot57+43\cdot24\)

\(=24\cdot\left(57+43\right)\)

\(=24\cdot100=2400\)

\(b,12\cdot19+12\)

\(=12\cdot\left(19+1\right)\)

\(=12\cdot20=240\)

\(c,43\cdot27+93\cdot42+57\cdot61+59\cdot57\)

\(=43\cdot\left(27+93\right)+57\cdot\left(61+59\right)\)

\(=43\cdot120+57\cdot120\)

\(= \left(43+57\right)\cdot120\)

\(=100\cdot120=12000\)

\(d,64\cdot6+81\cdot4+17\cdot6\)

\(=\left(64+17\right)\cdot6+81\cdot4\)

\(=81\cdot6+81\cdot4\)

\(=81\cdot\left(6+4\right)\)

\(=81\cdot10=810\)

a. x  ÷ 24 = 35736

              x = 35736  × 24

              x = 857664

b. 43  × 95  + 43  × 4  + 43

= 43  × ( 95  + 4  + 1)

= 43 × 100

= 4300

giúp mình v mn

a, 24.( 5 - 178 ) + 178 .(10 + 24)

= 24.5 - 24 .178 + 178 .10 + 178.24

= (24.5  + 178.10)  -( 24.178 - 178.24)

=(120 + 1780) - 0

= 1900

b ,29.(-101)

= 29.( -100 -1)

= - 2900  - 29

=   -2929

c, (-56 + 130) - (43 - 56) - (-20 - 43)

    = -56 + 130 - 43 + 56 + 20 + 43

= (-56 + 56) - (43 - 43) + ( 130 + 20)

= 0 - 0 + 150

= 150 

a) ...=24×6-24.178+24.178+178×10

=144+1780=1924

b) ...=29(-100-1)=-2900-29=-2929

c) ...=-56+130-43+56+20+43=130+20=150

`@` `\text {Ans}`

`\downarrow`

`a)`

`-(-18 + 45) - (18 + 55)`

`= 18 - 45 - 18 - 55`

`= (18 - 18) - (45 + 55)`

`= -100`

`b)`

`24. (5 - 178) + 178 . (10 + 24)`

`= 24.5 - 24.178 + 178. 10 + 178. 24`

`= 24.5 + 178.(-24 + 10 + 24)`

`= 24.5 + 178.10`

`=120 + 1780`

`=``1900`

`c)`

`29.(-101)`

`= -2929`

`d)`

\((- 56 + 130) – (43 – 56) – (- 20 – 43)\)

`= -56 + 130 - 43 + 56 + 20 + 43`

`= (56 - 56) + (130 + 20) + (-43+43)`

`= 150`

a: =24*5-24*178+178*10+178*24

=24*5+178*10

=1780+120=1900

b: =29*(-100)-29=-2900-29=-2929

c: =-56+130-43+56+20+43

=130+20=150

-5-9-11-24

=-14-11-24

=-25-24

=-49

-14-7-12-24

=-21-12-24

=-33-24

=-57

12+38-30-22

=50-30-22

=20-22

=-2

34+(-43)+66-55

=-9+66-55

=57-55

=2

-10-14-16+43

=-24-16+43

=-40+43

=3

4

1

62

31

321

3132132

3145461320...................22222222222222222222222223130

2222222222222222222222222222222222226

30.

3062+958*+96

33

.36+9.03693

.36363.

35/43 > 24/43

dấu:>

\(\frac{35}{43}\)> \(\frac{24}{43}\)

\(x+24=43-23\)

\(x+24=20\)

           \(x=20-24\)

           \(x=-4\)

x + 24 = 43 - 23

x + 24 = 20

x = 20 - 24

x = -4

x + 24 = 43 - 23

x + 24 =    10

x         = 10 - 24

x         =    - 14

đề bài này hình như sai lớp 4 ko thể có dạng toán âm được

43-[24-x]=20

=>24-x= 43-20 = 23

=>x = 24 - 23 = 1

Vậy....

    43-(24-x)=20

=>      24-x =43-20

=>      24-x =13

=>           x =24-13

=>           x =11

43 - I24-xI = 20 

  I24-xI = 43 - 20 

 I24-xI = 23 

 TH1 : 24 - x = 23 

             x = 24 - 23 

            x= 1

TH2 :   24 - x = (-23)

                 x = 24 -(-23)

                  x = 24 + 23 

                  x = 77

 Vậy X = 1 ; 77 

          học tốt @