27.39+27.63-2.27

= 27(39+63-2)

= 27. 100

= 2700

=2700

1.04680504681 k cho mình

\(=\dfrac{2\cdot3^9+3\cdot5\cdot2^{18}\cdot3^8}{2^9\cdot3^9\cdot2^{10}+2^{20}\cdot3^{10}}=\dfrac{2\cdot3^9+3^9\cdot2^{18}\cdot5}{2^{19}\cdot3^9+2^{20}\cdot3^{10}}\\ =\dfrac{2\cdot3^9\left(1+2^{17}\cdot5\right)}{2^{19}\cdot3^9\left(1+2\cdot3\right)}=\dfrac{1+2^{17}\cdot5}{2^{18}\cdot7}\)

\(A=8\cdot17\cdot125=\left(125\cdot8\right)\cdot17=1000\cdot17=17000\)

\(B=\left(25\cdot4\right)\cdot37=100\cdot37=3700\)

\(C=\left(75+50-25\right)\cdot58=100\cdot58=5800\)

\(D=\left(39+63-2\right)\cdot27=100\cdot27=2700\)

A=8.17.125= (8.125).17= 1000.17=17000

b=4.37.25=(4.25).37=100.37=3700

c= 58.75+58.50-58.25= 58.(75+50 - 25)= 58.100=5800

d=27.39+27.63-2.27= 27.(39+63-2)=27.100=2700

\(\Rightarrow3^{2x}\cdot3^{2x}=3^4\cdot3^3\\ \Rightarrow3^{4x}=3^7\\ \Rightarrow4x=7\Rightarrow x=\dfrac{7}{4}\)

\(3^{2x}.9^x=9^2.27\Rightarrow3^{2x}.3^{2x}=3^4.3^3\Rightarrow3^{4x}=3^7\Rightarrow4x=7\Rightarrow x=\dfrac{7}{4}\)

\(3^{2x}\cdot9^x=9^2\cdot27\)

\(\Leftrightarrow3^{4x}=3^4\cdot3^3=3^7\)

\(\Leftrightarrow x=\dfrac{7}{4}\)

125.98 - 25.46.5

= 125.98 - 25.5.46

= 125.98 - 125.46

= 125.(98 - 46)

= 125.52

= 125.4.13

= 500.13

= 6500

136.23 + 136.17 - 40.36

= 136.(23 + 17) - 40.36

= 136.40 - 40.36

= 40.(136 - 36)

= 40.100

= 4000

27.39 + 27.63 - 2.27

= 27.(39 + 63 - 2)

= 27.100

= 2700

a) 125 . 98 - 25 . 46 . 5

= 125 . 98 - 125 . 46

= 125 .(98 - 46)

= 125 . 52

= 6500

b) 136.23 + 136.17 - 40.36

= 136 . (23 + 17) - 40 . 36

= 136 . 40 - 40 . 36

= (136 - 36) . 40

= 100 . 40

= 4000

27.39 + 27.63 - 2.27

= 27 . (39 + 63 - 2)

= 27 . 100

= 2700

a)58.75+58.50-58.25

=58.(75+50-25)

=58.100

=5800

b)27.39+27.63-2.27

=27.(39+63-2)

=27.100

=2700

c)128.46+128.32+128.22

=128.(46+32+22)

=128.100

=12800

a) 58.75 + 58 . 50 - 58 . 25
= 58 . ( 75 + 50 - 25 )
= 58 . 100
= 5800
b) 27 . 39 + 27 . 63 - 2 . 27
= 27 . ( 39 + 63 - 2 )
= 27 . 100
= 2700
c) 128 . 46 + 128 . 32 + 128 . 22
= 128 . ( 46 + 32 + 22 )
= 128 . 100
= 12800
 

a)   58.75 + 58.50 - 58.25 = 58(75 + 50 - 25) = 58.100 = 5800

b)   27.39 + 27.63 - 2.27 = 27(39 + 63 -2) = 27.100 = 2700

c)    128.46 + 128.32 +128.22 = 128(46 + 32 + 22) = 128.100 = 12800

Bài 1

a) (3x - 2⁴).7³ = 2.7⁴

3x - 16 = 2.7⁴ : 7³

3x - 16 = 2.7

3x - 16 = 14

3x = 14 + 16

3x =30

x = 30 : 3

x = 10

b) x - [42 + (-28)] = -8

x - 14 = -8

x = -8 + 14

x = 6

c) 4 - 7.x = x - (13 - 4)

x + 7x = 4 + 9

8x = 13

x = 13/8

Bài 1: a,   (3\(x\) - 2⁴ ).7³ = 2.7⁴

                3\(x\) - 2⁴    = 2.7⁴ : 7³

                3\(x\)  - 16   = 14

                 3\(x\)           = 30 

                    \(x\)          = 10

b, \(x\) - (42 + (-28) ] = -8

    \(x\) - 14 = -8

    \(x\)        = 14 - 8

    \(x\)        = 6

c, 4 - (7\(x\)) = \(x\) - (13 - 4)

   4 - 7\(x\)   = \(x\) - 9

        \(x\) + 7\(x\) = 4 + 9

          8\(x\)     = 13

             \(x\)    = \(\dfrac{13}{8}\)

Bài 2

a) 58.75 + 58.50 - 58.25

= 58.(75 + 50 - 25)

= 58.100

= 5800

b) 27.39 + 27.63 - 2.27

= 27.(39 + 63 - 2)

= 27.100

= 2700

c) 48.13 + 48.115 + 134.52

= 48.(13 + 115) + 134.52

= 48.128 + 134.52

= 6144 + 6968

= 13112

d) 27.121 - 87.27 + 73.34

= 27.(121 - 87) + 73.34

= 27.34 + 73.34

= 34.(27 + 73)

= 27.100

= 2700