là sao là sao là sao

a) \(\frac{2^{47}\cdot5^{14}\cdot18^{13}\cdot45^{17}}{180^{30}}\)

=\(\frac{2^{47}\cdot5^{14}\cdot2^{13}\cdot3^{26}\cdot3^{34}\cdot5^{17}}{2^{60}\cdot3^{60}\cdot5^{30}}\)

=\(\frac{2^{60}\cdot3^{60}\cdot5^{31}}{2^{60}\cdot3^{60}\cdot5^{30}}\)

=\(\frac{5^{31}}{5^{30}}=5\)

a) (2⁴⁷ x 5¹⁴ x 2¹³ x 9¹³ x 5¹⁷ x 9¹⁷ ) : (2³⁰ x 2³⁰ x 5³⁰ x 9³⁰)

(2⁶⁰ x 5³¹ x 9³⁰) : (2⁶⁰ x 5³⁰ x 9³⁰) = 5

a,[(-18)+(-17)+10]-(-18)

=-18-17+10+18

=(-18+18)+(-17+10)

=0-7

=-7

b,(-11+14).(-3+7)

=-11.(-3)+(-11).7+14.(-3)+14.7

=33+(-77)+(-42)+98

=(33+98)+[-77+(-42)]

=131-119

=12

c,45.(-10)+3.15.(-2)+2.45

=45.[(-10)+3.(-2)+2]

=45.-14

=-630

a) \(\text{ }\left[\left(-18\right)+\left(-17\right)+10\right]-\left(-18\right)\)

\(=\text{ }\left[\left(-18\right)+\left(-17\right)+10\right]+18\)

\(=\left(-18\right)+\left(-17\right)+10+18\)

\(=\text{ }\left[\left(-18\right)+18\right]+\text{ }\left[\left(-17\right)+10\right]\)

\(=0+\left(-7\right)\)

\(=-7\)

e

, 11-12 +13-14 +15-16 +17-18+19-20

= (11-12) +(13-14) +(15-16) +(17-18) +(19-2)

= - 1 . 4 + (19-2)

= 4 + 17

= 21

e,-5

f,-200

(5 \(\times\) 13 - 45) \(\times\) \(x\) - 47 = 13

(65 - 45) \(\times\) \(x\)                = 13 + 47

20 \(\times\) \(x\)                         = 60

         \(x\)                         = 60 : 20

          \(x\)                        = 3

\(\Leftrightarrow\left(65-45\right)x-47=13\)
\(\Leftrightarrow20x=13+47=60\)
\(\Leftrightarrow x=3\)
Vậy \(x=3\) 

a) - (-30) - x = - (+13)

30 - x = -13

x = 30 - (-13)

x = 43

b) - (+12) - (+x) = 20

-12 - x = 20

x = -12 - 20

x = -32

c) ( -34) - x = - (-45)

-34 - x = 45

x = -34 - 45

x = -79.

a) - ( -30 ) - x = - ( 13 )

30 - x = -13

x = 30 + 13

x = 43

b) -( 12 ) - x = 20

-12 - x = 20

x = -12 - 20

x = -32

c) ( -34 ) - x = - ( -45 )

-34 - x = 45

x = -34 - 45

x = -79