ấn phím esc

tắt máy là đc

S=1+2+2^2+2^3+....+2^9

2S=2+2^2+2^3+.....+2^10

2S-S=2^10-1

=>S=2^10-1

      =1024-1

      =1023

5.2^8=5.256=1280

Vì 1023<1280=>S<5.2^8

1+2+2²+2³+2⁴+.........+2⁹

2S= 2+2²+2³+2⁴+........+2⁹+2¹⁰

2S-S= ( 2+2²+2³+2⁴+........+2⁹+2¹⁰)-(1+2+2²+2³+2⁴+.........+2⁹)

S= 2¹⁰-1

Ta có: 5.2⁸= (4+1).2⁸

                 = 4.2⁸+ 2⁸

                    = 2².2⁸+2⁸

                = 2¹⁰+2⁸

=> 2¹⁰-1 < 2¹⁰+2⁸

Hay S < 5.2⁸

x-7=-5

   x=-5+7

   x=2

vậy x=2

128-3.(x+4)=23

3.(x+4)=128-23

3.(x+4)=105

x+4=105:3

x+4=35

    x=35-4

    x=31

vậy x=31

|x+2|=0

x+2=0

    x=0-2

    x=-2

vậy x=-2

|x-5|=|-7|

x-5=7

   x=7+5

   x=12

vậy x=12

11.x-9.x=2

x.(11-9)=2

x.2=2

   x=2:2

   x=1

vậy x=1

11.x-9.x=2

11.x-9.x=x.(11-9)=x.2

Suy ra x.2=2

             x=2:2

             x=1

Học tốt nhé

minmum là gì vậy bn

[125^3 . 7^5 - 175^5 : 5] : 2004^2005

= 0 : 2004^2005

=0

gái xính thế

\(a.33+x=45\)

\(x=12\)

\(d.x-8=20\)

\(x=28\)

\(h.2\left(x-51\right)=2^4+20\)

\(2\left(x-51\right)=16+20\)

\(2\left(x-51\right)=36\)

\(x-51=18\)

\(x=69\)

\(e.x+41=100\)

\(x=59\)

\(i.x-19=9\)

\(x=28\)

\(b.x+73=102\)

\(x=29\)

\(f.3^x=3^2\)

\(\Rightarrow x=2\)

\(j.4\left(x-3\right)=49-1\)

\(4\left(x-3\right)=48\)

\(x-3=12\)

\(x=15\)

\(c.x+9=39\)

\(x=30\)

\(g.4^x=4^3\)

\(\Rightarrow x=3\)

\(k.9^{x-1}=81\)

\(9^{x-1}=9^2\)

\(\Rightarrow x-1=2\)

\(x=3\)

47-[(45.2⁴-5².12):14]

=47-[(720-300):14]

=47-[420:14]

=47-30

=17

1560:[5.79-(125+5.49)+5.21]

=1560:[395-(125+245)+105]

=1560:[395-370+105]

=1560:130

=12

50-[(20-2³):2+34]

=50-[(20-8):2+34]

=50-[12:2+34]

=50-[6+34]

=50-40

=10

d, 695-[200+(11-1)^{2 ]}  

=695-[200+10² ]

=695-[200+300]

=695-500

=195

2345-1000:[19-2.(21-18)² ]

=2345-1000:[19-2.3²  ]

=2345-1000:[19-18]

=2345-1000:1

=2345-1000

=1345

Bạn làm tiếp nha

Mai mk làm tiếp 

Dài quá

Chúc bn học tốt

   63 . 44 + 37 . 117 - 73 . 37

= 63 . 44 + 37 . ( 117 - 73 )

= 63 . 44 + 37 . 44

= ( 63 + 37 ) . 44

=  100 . 44

=   4400