30,31

36+1

20

88

Bài 23: Tìm x:

a) 29 < 30 < 32

b) 36 < 37 + 1 < 39

c) 30 + 30 < 64

d) 46 < 88 - 42 < 48

a, 30

b,37

c, 30

d, 88

mik ko biết

 Bài 1 : 

a ) 13,75 + 13,25 - 300 = 27 - 300 = -273

b ) 5,4² - ( 30 - 3³ ) = 29,16 - ( 30 - 27 ) = 29,16 - 3 = 26,16

c ) 6² : 2 + 2,3² = 36 : 2 + 5,29 = 18 + 5,29 = 23,29

 Bài 2 :  chịu

 Bài 3 : 

a ) x + 13 = 35

x = 35 - 13 = 22

b,c ) chịu

Câu 1

a/ 13.75+13.25-300=13.(75+25)-300=1300-300=1000

b/5.4^2-(30-3^3)=80-3=77

c/6^2:2+2.3^2=36:2+2.9=36

Câu 2

A={12;13;14;15;16;17;18;19;20}

Câu 3

a/x+13=35=)x=35-13=22

b/28-2x=14=)2x=14=)x=7

c/x^10=x^7=)x^10-x^7=x^3=0=)x=0

x^10-x^7=1=)x=1

câu g sai rùi đó bạn

a) \(2^2.3-\left(1^{10}+8\right):3^2\)

\(=4.3-\left(1+8\right):9\)

\(=12-9:9\)

\(=12-1\)

\(=11\)

b) \(115^0+13.75+13.25-140\)

\(=0+13.\left(75+25\right)-140\)

\(=0+13.100-140\)

\(=0+1300-140\)

\(=1300-140\)

\(=1160\)

Bài 9,

6²x73+36x3³=36x73+36x27=36(73+27)=36x100=3600.

197-\([\)6x(5-1)²+2022⁰\(]\):5=197-\([\)6x16+1\(]\):5=197-97:5=197-97/5=888/5.

Bài 10,

21-4x=13

=>4x=21-13=8

=>x=8:4=2.

30:(x-3)+1=4⁵:4³=4²=16

=>30:(x-3)=16-1=15

=>x-3=30:15=2

=>x=2+3=5.

(x-1)³+5x6=38

=>(x-1)³+30=38

=>(x-1)³=38-30=8=2³

=>x-1=2

=>x=3.

a: =>x+50=9/4

hay x=-47,75

b: =>4x-16=(4000+12)x2=8024

=>4x=8040

hay x=2010

a) \(\left(x+50\right):4=3^2\)

\(x+50:4=9\)

\(x+50=4.9\)

\(x+50=36\)

\(x=36-50\)

\(x=-14\)

b) \(\left(4x-16\right):2-\left(-12\right)=4000\)

\(4x-16:2-12.2=4000\)

\(4x-16:2-24=4000\)

\(4x-\left(16+24\right);2=4000\)

\(4x-30:2=4000\)

\(4x-30=4000.2\)

\(4x-30=8000\)

Bài 2:

6000:30=600:3=200

5462:2=2731

45678:6=7613

Bài 1:

\(36\cdot50=36\cdot5\cdot10=180\cdot10=1800\)

\(59\cdot60=59\cdot6\cdot10=354\cdot10=3540\)

\(90\cdot40=90\cdot4\cdot10=360\cdot10=3600\)