[x-236 nhan 6 ]nhan 8 =936
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(6.\left(x+9845\right)=29042.6\)
\(x+9845=29042\)
\(x=19197\)
\(\left(x:3\right).8=8.3198\)
\(x:3=3198\)
\(x=1066\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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!
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(C=\frac{4}{2\cdot4}+\frac{4}{4\cdot6}+\frac{4}{6\cdot8}+...+\frac{4}{2008\cdot2010}\)
\(C=\frac{2}{1\cdot2}+\frac{2}{2\cdot3}+\frac{2}{3\cdot4}+...+\frac{2}{1004\cdot1005}\)
\(C=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{1004}-\frac{1}{1005}\)
\(C=1-\frac{1}{1005}\)
\(C=\frac{1004}{1005}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
[ x-236×6]×8=936-
x-236×6 =936:8
x-236×6. = 117