Bài 1:tính 

a)65.(-19)+19.(-35)

=65.(-19)+(-19).35

=(-19).(65+35)

=(-19).100

=-1900

b)85.(35-27)-35.(85-27)

=85.35-85.27-35.85+35.27

=(85.35-35.85)+(-85.27+35.27)

=27.(-85+35)

=27.(-50)

=1350

c)47.(45-15)-47.(45+15)

=47.[(45-15)-(45+15)]

=47.[30-60]

=47.(-30)

=-1410

Bài2: Tìm các số nguyên x biết

a)(-2).(x+6)+6.(x-10)=8

-2x-12+6x-60=8

4x-72=8

4x=72+8

4x=50

 x=\(\frac{25}{2}\)

b)(-4).(2x+9)-(-8x+3)-(x+13)=0

-6x-36+8x-3-x-13=0

x-41=0

     x=41

Bài 1: Tính

a) \(65.\left(-19\right)+19.\left(-35\right)\)

= \(-1235+-665\)

= \(-1900\)

b) \(85.\left(35-27\right)-35.\left(85-27\right)\)

= \(-1350\)

c) \(47.\left(45-15\right)-47.\left(45+15\right)\)

=\(-1410\)

Bài 2: Tìm x:

\(\left(-2\right).\left(x+6\right)+6.\left(x-10\right)=8\)

\(x=20\)

a) \(\left(19x+2\times5^2\right):14=\left(13-8\right)^2-4^2\)

\(\Rightarrow\left(19x+50\right):14=5^2-4^2=25-16=9\)

\(\Rightarrow19x+50=126\)

\(\Rightarrow19x=76\Rightarrow x=4\)

Vậy x = 4

b) \(2\times3^2=10\times3^{12}+8\times27^4\)

\(\Rightarrow2\times3^2=10\times\left(3^3\right)^4+8\times27^4\)

\(\Rightarrow2\times3^2=27^4\times\left(10+8\right)\)

\(\Rightarrow18=27^4\times18\)

\(\Rightarrow27^4\times18-18=0\Rightarrow18\times\left(27^4-1\right)=0\)

=> Không thấy biến x đâu cả

c) Ta thấy 3³ = 27

\(\Rightarrow3^{2x-5}=3^3\Rightarrow2x-5=3\Rightarrow2x=8\Rightarrow x=4\)

Vậy x = 4

d) \(3^{x+1}-x=80\Rightarrow3^{x+1}=81\)

Ta thấy 3⁴ = 81

\(\Rightarrow3^{x+1}=3^4\Rightarrow x+1=4\Rightarrow x=3\)

Vậy x = 3

Ta có: 4-(27-3) = x-(13-4)

4-24 = x-11

x-11 =-20

x     =-19

Vậy: x = -19

4 – (27 - 3) = x – (13 - 4)

4 - 27 + 3 = x - 13 + 4 (bỏ dấu ngoặc có dấu "-" đằng trước)

- 27 + 3 = x - 13 (tính chất a + c = b + c => a = b)

-24 = x - 13

-24 + 13 = x (chuyển -13 sang vế trái)

-11 = x

hay x = -11

4 – (27 - 3) = x – (13 - 4)

4 - 27 + 3 = x - 13 + 4 (bỏ dấu ngoặc có dấu "-" đằng trước)

- 27 + 3 = x - 13 (tính chất a + c = b + c => a = b)

-24 = x - 13 -24 + 13 = x (chuyển -13 sang vế trái)

-11 = x

hay x = -11

Tìm x εIN biết
a) 390 - (x-8) = 168:13
b) (x-140) : 7 = 27 - 24
c) x- 6 :2 - ( 48 - 24 ) :2 :6 - 3 = 0
d) x+5.2-(32+16.3:6-15)=0

b) \(\left(x-140\right):7=27-24\)

\(\left(x-140\right):7=3\)

\(x-140=21\)

\(x=161\)

      vay   \(x=161\)

c) \(x-6:2-\left(48-24\right):2:6-3=0\)

\(x-3-24:2:6-3=0\)

\(x-3-2-3=0\)

\(x-8=0\)

\(x=8\)

vay \(x=8\)

d) \(x+5.2-\left(32+16.3:6-15\right)=0\)

\(x+10-\left(32+8-15\right)=0\)

\(x+10-25=0\)

\(x-15=0\)

\(x=15\)

vay \(x=15\)

a) \(390-\left(x-8\right)=168:13\)

\(390-x+8=\frac{168}{13}\)

\(x+8=390-\frac{168}{13}\)

\(x+8=\frac{5070}{13}-\frac{168}{13}\)

\(x+8=\frac{4902}{13}\)

\(x=\frac{4902}{13}-8\)

\(x=\frac{4798}{13}\)

vay \(x=\frac{4798}{13}\)

a)\(\frac{x+32}{11}+\frac{x+23}{12}=\frac{x+38}{13}+\frac{x+27}{14}\)

\(\left(\frac{x-1}{11}+3\right)+\left(\frac{x-1}{12}+2\right)=\left(\frac{x-1}{13}+3\right)+\left(\frac{x-1}{14}+2\right)\)

\(\left(\frac{x-1}{11}+\frac{x-1}{12}\right)+\left(3+2\right)=\left(\frac{x-1}{13}+\frac{x-1}{14}\right)+\left(3+2\right)\)

\(\frac{x-1}{11}+\frac{x-1}{12}=\frac{x-1}{13}+\frac{x-1}{14}\)

\(\frac{x-1}{11}+\frac{x-1}{12}-\frac{x-1}{13}+\frac{x-1}{14}=0\)

\(\left(x-1\right)\left(\frac{1}{11}+\frac{1}{12}-\frac{1}{13}+\frac{1}{14}\right)=0\)

Vì \(\frac{1}{11}+\frac{1}{12}\ne\frac{1}{13}+\frac{1}{14}\)\(\Rightarrow\frac{1}{11}+\frac{1}{12}-\frac{1}{13}+\frac{1}{14}\ne0\)

\(\Rightarrow x-1=0\)

\(\Rightarrow x=1\)

cái này là lớp 7 mà

phần a ra x=1

(x-13)/87+(x-27)/73+(x-67)/33+(x-73)/27=4

=>(x-13-87)/87+(x-27-73)/73+(x-67-33)/33+(x-73-27)/27=4-1-1-1-1

=>(x-100)/87+(x-100)/73+(x-100)/33+(x-100)/27=0

=>(x-100)*(1/87+1/73+1/33+1/27)=0

=>x-100=0

=>x=100

\(5\cdot2^{x-3}-13=27\)

\(\Leftrightarrow5\cdot2^{x-3}=40\)

\(\Leftrightarrow2^{x-3}=8\)

\(\Leftrightarrow2^{x-3}=2^3\)

\(\Leftrightarrow x-3=3\)

\(\Leftrightarrow x=6\)

thanks nhìu

\(\frac{58}{27}.\frac{54}{29}< x< \frac{100}{3}-\frac{9}{13}\)

\(4< x< 32\frac{25}{39}\)

\(=>x\in\left\{5;6;7...;32\right\}\)

K cho mik với nhé 

d, 32%-0,25:x=-3/2/5

0,32-0,25:x=-3,4

-0,25:x=-3,4-0,32

-0,25:x=-3,72

x=-0,25:-3,72

x=25/372

7/8+4/1/2:x=-13/40

0,875+4,5:x=-0,325

4,5:x=-0,325-0,875

4,5:x=-1,2

x=4,5:-1,2

x=-3,75