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a,2/11:1/3x3/2

=6/11x3/2

=9/11

b,15/24+3/4-1/6

=11/8-1/6

=29/24

c,5/2x1/3+1/5

=5/6+1/5

=31/30

d,\(2\dfrac{3}{8}\)-\(1\dfrac{1}{4}+5\dfrac{1}{3}\)

=19/8-5/4+16/3

=9/8+16/3

=155/24

e,7/13x5/14x39/15

=5/26x39/15

=1/2

f,[5/2+1/4]:[1-1/3]

=11/4:2/3

=33/8

g,18/13x[9/4-2/5]x1/2

=18/13x37/20x1/2

=333/130x1/2

=333/260

2/11 : 1/3 x 3/2  = 9/11

15/24 + 3/4 - 1/6 = 29/24

5/2 x1/3+ 1/5 = 31/30

2 và 3/8 - 1  và 1/4 + 5 và 1/3 ? là sao ?

7/13 x 5/14 x 39 /15 = 1/2

[ 5/2 + 1/4 ] : [ 1 - 1/3 ] = 11/4 : 2/3 = 33/8

[ 3/4 - 1/5 ] x 9/2 - 1/7 = 11/20 x 9/2 - 1/7 = 653/280

18/13 x [ 9/4 - 2/5 ] 1/2 ... x 1/2 à

\(\dfrac{2}{11}:\dfrac{1}{3}x\dfrac{3}{2}=\dfrac{6}{11}x\dfrac{3}{2}=\dfrac{9}{11}\)

\(\dfrac{15}{24}+\dfrac{3}{4}-\dfrac{1}{6}=\dfrac{11}{8}-\dfrac{1}{6}=\dfrac{29}{24}\)

\(\dfrac{5}{2}x\dfrac{1}{3}+\dfrac{1}{5}=\dfrac{5}{6}+\dfrac{1}{5}=\dfrac{31}{30}\)

\(2\dfrac{3}{8}-1\dfrac{1}{4}+5\dfrac{1}{3}=\dfrac{19}{8}-\dfrac{5}{4}+\dfrac{16}{3}=\dfrac{9}{8}+\dfrac{16}{3}=\dfrac{155}{24}\)

\(\dfrac{7}{13}x\dfrac{5}{14}x\dfrac{39}{15}=\dfrac{5}{26}x\dfrac{39}{15}=\dfrac{1}{2}\)

\(\left[\dfrac{5}{2}+\dfrac{1}{4}\right]:\left[1-\dfrac{1}{3}\right]=\dfrac{11}{4}:\dfrac{2}{3}=\dfrac{33}{8}\)

\(\left[\dfrac{3}{4}-\dfrac{1}{5}\right]x\dfrac{9}{2}-\dfrac{1}{7}=\dfrac{11}{20}x\dfrac{9}{2}-\dfrac{1}{7}=\dfrac{99}{40}-\dfrac{1}{7}=\dfrac{653}{280}\)

\(\dfrac{18}{13}x\left[\dfrac{9}{4}-\dfrac{2}{5}\right]x\dfrac{1}{2}=\dfrac{18}{13}x\dfrac{37}{20}x\dfrac{1}{2}=\dfrac{330}{130}x\dfrac{1}{2}=\dfrac{330}{260}\)

\(a,7x=713+8\\ 7x=721\\ x=721:7\\ x=103\\ b,34x=648-444\\34x=204\\ x=204:34\\ x=6 \)

a) đề bài 
=7X=713+8

b) Đề bài 
=−34X=444−648
=−34X=−204
=\(x=\dfrac{-204}{-34}\)

\(a,\dfrac{23}{33};\dfrac{2}{3};\dfrac{6}{11}\\ b,\dfrac{9}{8};\dfrac{8}{9};\dfrac{8}{11}\)

sắp xếp thứ tự từ lớn đến bé 

a , 6/11 ; 23/33 ; 2/3

⇒ \(\dfrac{22}{33};\dfrac{2}{3};\dfrac{6}{11}\)

b , 8/9 ; 8/11 ; 9/8 

⇒ \(\dfrac{9}{8};\dfrac{8}{9};\dfrac{8}{11}\)

`779 : 41 xx 16 xx (425 - 249)`

`=779 : 41 xx 16 xx 176`

`= 19 xx 16 xx 176`

`=304xx 176`

`= 53504`

\(=304\cdot176=53504\)

$779:41\times 16\times (425-249)$

$=779:41\times 16\times 176$

$=19\times 16\times 176$

$=304\times 176$

$=53504$

3254+146+169

=3400+169

=3569

4.27.25

=108.25

=2700

638+780.5-369:9

=638+3900-41

=4538-41

=4497

779:41.16.(425-249)

=779:41.16.186

=19.16.186

=304.186

=56544

25.5.4.27.2

=125.4.27.2

=500.27.2

=13500.2

=27000

28.64+28.36

=28.(64+36)

=2800

(42.43+43.57+43)-360:4

=(1806+2451+43)-360:4

=4300-360:4

=4300-90

=4210

a) = 3400 + 169 = 3569

b) = 108 x 25 = 2700

c) = 638 + 3900 - 369 : 9 = 4497

d) = 779 : 41 x 16 (435 - 249) = 56544

e) = 125 x 4 x 27 x 2 = 27000

f) = 1792 + 28 x 36 = 2800

g) = 43 x 100 - 90 = 4210

`(x+1)+(x+4)+...+(x+28)=245`

`=> (x+x+...+x)+(1+4+7+...+28)=245`

`=> 10x+[(28+1)xx10:2]=245`

`=> 10x+(29xx5)=245`

`=> 10x+145=245`

`=> 10x=100`

`=> x=10`

`(x+1)+(x+4)+(x+7)+........+(x+28)=245`

`x+1+x+4+x+7+.........+x+28=245`

`(x+x+.......+x)+(1+4+7+.....+28)=245`

Khoảng cách : `3`

Số hạng:

`(28-1)/3+1=10(số)`

Tổng:

`(28+1).10:2=145`

`=> 10x+145=245`

`10x=245-145`

`10x=100`

`x=100:10`

`x=10`

Vậy `x=10`

`2/9 - 7/8 x = 1/3`

`7/8 x = 2/9 -1/3`

`7/8x = 2/9 - 3/9`

`7/8x = -1/9`

`x=-1/9:7/8`

`x=-1/9 xx 8/7`

`x=-8/63`

___________________________________

`(14,17-x) . 2/9 = 1/3`

`14,17-x=1/3:2/9`

`14,17-x=1/3 . 9/2`

`14,17-x=3/2`

`14,17-x=1,5`

`x=14,17-1,5`

`x=12,67`

a: =>7/8x=-1/9

=>x=-1/9:7/8=-1/9x8/7=-8/63

b: =>14,17-x=1/3:2/9=1/3x9/2=9/6=3/2

=>x=14,17-1,5=12,67

`2/9 - 7/8 xx x = 1/3` 

`=>  7/8 xx x = 2/9 -1/3`

`=>  7/8 xx x = 2/9-3/9`

`=>  7/8 xx x = -1/9`

`=>x=-1/9 : 7/8`

`=>x=-1/9 xx 8/7`

`=>x=-8/63`

`---------`

`(14 , 17 - x) xx 2/9 = 1/3 `

`=> 14 , 17 - x =1/3 : 2/9`

`=> 14 , 17 - x =1/3 xx 9/2`

`=> 14 , 17 - x = 3/2`

`=>x=14,17-3/2`

`=>x= 12,67`

=>2,78x=36,726

=>\(x\simeq13.21\)

`2,78 xx x - 0,126 = 3 xx 12,2`

`=> 2,78 xx x - 0,126 =36,6`

`=> 2,78 xx x=36,6 + 0,126`

`=>  2,78 xx x=36,726`

`=>x= 36,726 : 2,78`

`=>x= ....`