b/4 mũ 2 nhân 2 mũ 3 =128=2 mũ 7

Bài 1 :

a, Ta có : \(\left(-123\right)+\left|-13\right|+\left(-7\right)\)

= \(\left(-123\right)+13+\left(-7\right)=\left(-117\right)\)

b, Ta có : \(\left|-10\right|+\left|45\right|+\left(-\left|-455\right|\right)+\left|-750\right|\)

= \(10+45-455+750=350\)

c, Ta có : \(-\left|-33\right|+\left(-15\right)+20-\left|45-40\right|-57\)

= \(\left(-33\right)+\left(-15\right)+20-5-57=-90\)

a) x=0

b) x=46

c) hình như sai đề

d)x=4

e)x=6

f)x=8

h) hình như sai đề

i) x=5

j)x=2

l) x= 15 hoặc x = -15

m) x=5

n) x=18,5

o)x=2

u)x thuộc N

p)x =2

s)x=3

k)x=2

z)x=2

a)2^x+1.2^2014=2^2015

2^x+1=2^2015:2^2014

2^x+1=2^1

=>x+1=1

x=2

b)2x-49=5.3^2

2x-49=45

2x=45+49

2x=94

x=47

c)3^2.(x+14)-5^2=5.2^2

9.(x+14)-25=20

9.(x+14)=45

x+14=5

x=11

d)6x+x=5^11:5^9+3^1

x.(6+1)=28

x.7=28

x=4

e)7x-x=5^21:5^19+3.2^2-7^0

x.(7-1)=36

x.6=36

x=6

f)7x-2x=6^17:6^15+44:11

x.(7-2)=40

x.5=40

x=8

g)4^x=6

=>ko tìm dc x

h)9^x-1=9

=>x-1=1

x=2

i)2^x:2^5=1

2^x-5=2^0

=>x-5=0

x=5

j)/x-2/=0

=>x-2=0

x=2

l)/x-5/=7--3

/x-5/=10

TH1:x-5=10

x=15

th2:x-5=-10

x=-5

m)5x+x=39-3^11:3^9

x.(5+1)=30

x.6=30

x=5

u)0:x=0

=>x thuộc Q

p)3^x=9

3^x=3^2

=>x=2

s)4^x=64

4^x=4^3

=>x=3

k)9^x-1=9

=>x-1=1

x=2

z)x^4=16

x^4=2^4

=>x=2

có mấy câu bị trùng đề bài ấy , bạn ạ

(3x-6)+3=3^2

3x+3=3^2

3*(x+1)=9

x+1=9:3

x+1=3

x=3-1=2

Bài làm

m) (x + 2).(3 - x) = 0;     

=> x + 2 = 0 hoặc 3 - x = 0

=> x = -2 hoặc x = 3

Vậy x = -2 hoặc x = 3   

d) 5¹¹.7¹² + 5¹¹.7¹¹ 

= 5¹¹ . ( 7¹² + 7¹¹ )

= 5¹¹ . [ 7¹¹ . ( 7 + 1 ) ]

= 5¹¹ . 7¹¹ . 8

= ( 5 . 7 )¹¹ . 8

= 35¹¹ . 8

5¹².7¹² + 9.5¹¹.7¹¹ 

= 5¹¹ ( 5 . 7¹² + 9 . 1 . 7¹¹ )

= 5¹¹ [ 7¹¹ ( 5 . 7 + 9 . 1 . 1 ) ]

= 5¹¹ ( 7¹¹ . 44 )

= 5¹¹ . 7¹¹ . 44

= 35¹¹ . 44

m.  \(\left(x+2\right)\left(3-x\right)=0\Leftrightarrow\orbr{\begin{cases}x+2=0\\3-x=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=-2\\x=3\end{cases}}\)

d. \(\frac{5^{11}.7^{12}+5^{11}.7^{11}}{5^{12}.7^{12}+9.5^{11}.7^{11}}=\frac{5^{11}.\left(7^{12}+7^{11}\right)}{5^{11}.\left(5.7^{12}+9.7^{11}\right)}=\frac{7^{12}+7^{11}}{5.7^{12}+9.7^{11}}=\frac{1}{5.9}=\frac{1}{45}\)

q. \(\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10+11=11\)

\(\Rightarrow\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10=0\)

\(\Rightarrow\left[\left(x-3\right)+\left(x-2\right)+\left(x-1\right)\right]+(1+2+3+...+10)=0\)

\(\Rightarrow\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+55=0\)

\(\Rightarrow x-3+x-2+x-1=-55\)

\(\Rightarrow3x-6=-55\)

\(\Rightarrow3x=-49\)

\(\Rightarrow x=-\frac{49}{3}\)