\(6.\left(x+9845\right)=29042.6\)

\(x+9845=29042\)

\(x=19197\)

\(\left(x:3\right).8=8.3198\)

\(x:3=3198\)

\(x=1066\)

Lời giải  đầy đủ:

Bài 3:tìm x

A,

6.(x+9845)=29042.6

(x+9845)=29042.6:6

x+9845=29042

x=29042-9845

x=19197.

B,

(x:3).8=8.3198

(x:3)=3198.8:8

x:3=3198

x=3198.3

x=9594.

Bài 7:

A/191+x+9=43.5

200+x=215

x=215-200

x=15.

B/x.25.4=125.8

x.100=1000

x=1000:100

x=10.

Bài 8:

A/ 128.x-12.x-16.x=5208000

(128-12-16).x=5208000

100.x=5208000

x=5208000:100

x=52080.

B/ x.27+x.30+x.43=210500

x.(27+30+43)=210500

x.100=210500

x=210500:100

x=2105.

K mình nhé!

a) (x.7 +8):5=10

x.7 +8= 10.5=50

x.7= 50-8=42

x= 42:7=6

b) 280: (7+3.x)=4

7+3.x= 4.280= 1120

3.x= 1120-7 =1113

x= 1113: 3= 371

c)  (x.5) .19:13= 57

(x.5). 19= 57.13= 741

x.5= 741: 19= 39

x= 39:5 =7,8

d)  6.(28-8).x = 72

20.x= 72:6= 12

x= 12: 20= 0,6

e) 4. (36-4.x)= 3,2

36-4.x= 32:4= 0,8

-4.x= 0,8- 36= -35,2

x= -35,2 : -4 = 8,8

f) (x-15).3 :12= 6

(x-15).3 = 6. 12= 72

x-15= 72: 3= 24

x= 24+ 15= 39

g)  (x:4+ 6) . 7 = 70

x:4+6= 70:7= 10

x:4= 10-6= 4

x= 4.4 = 16

h)  (x:2+50) :5= 12

x:2+ 50= 12.5= 60

x:2= 60-50= 10

x= 10.2=20

l) 5.(7+3.x)= 140

7+3.x= 140:5 = 28

3.x= 28-7 =21

x= 21: 3= 7

k cho mình nhe

7/4 tru 4/3 nhan y bang 5/19
 

[X nhan 7 cong 8 ] chia 5 = 10 280 chia [7 cong 3 nhan X] = 4 [ X nhan 5] nhan 19 chia 13= 57 6 nhan [28 - 8] nhan X ] = 72 4 nhan [ 36 - 4 nhan X] = 3,2 [X - 15] nhan 3 chia 12 =6 [ X chia 4 cong 6] nhan 7=70 [ X chia 2 cong 50] chia 5=12 5 nhan [ 7 cong 3 nhan X] = 140  help me ////\\\\\  tim X nha mn jup mk ik mk dg voi lam

1/10x(2/9x9/2)x(3/8x8/3)x(5/6x6/5)=1/10x1x1x1=1/10

a)(11*9-100+1):(1*2*3*4*5*6*7*8*9*10)

=0:(1*2*3*4*5*6*7*8*9*10)

=0

a)(11*9-100+1):(1*2*3*4*5*6*7*8*9*10)
=0:(1*2*3*4*5*6*7*8*9*10)
=0

hacker 2k6

\(C=\frac{4}{2\cdot4}+\frac{4}{4\cdot6}+\frac{4}{6\cdot8}+...+\frac{4}{2008\cdot2010}\)

\(C=\frac{2}{1\cdot2}+\frac{2}{2\cdot3}+\frac{2}{3\cdot4}+...+\frac{2}{1004\cdot1005}\)

\(C=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{1004}-\frac{1}{1005}\)

\(C=1-\frac{1}{1005}\)

\(C=\frac{1004}{1005}\)

4 x 5 x 6/8 x 10 x 12

= 4 x 5 x 3/4 x 10 x 12

3 x 5 x 10 x 12

= 1800

sai roi