\(a,x-36:18=12-15\\ \Rightarrow x-2=-3\\ \Rightarrow x=-1\\ b,92-\left(17+x\right)=72\\ \Rightarrow17+x=20\\ \Rightarrow x=3\\ c,720:\left[41-\left(2x+5\right)\right]=40\\ \Rightarrow41-\left(2x+5\right)=18\\ \Rightarrow2x+5=23\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ d,\left(x+2\right)^3-23=41\\ \Rightarrow\left(x+2\right)^3=64\\ \Rightarrow\left(x+2\right)^3=4^3\\ \Rightarrow x+2=4\\ \Rightarrow x=2\)

b: =>x+17=20

hay x=3

d: =>x+2=4

hay x=2

A = 1
B = 3
C = 9
D = 2

a) 58.57+58.150-58.125   

=58.(57+150-125)

=58.    82

=    4756        

b)3².5-2².7+83.2019⁰

=9.5-4.7+83

=45-28+83

=100

c)2019+(-247)+(-53)-2019 

 =(2019-2019)+[ (-247)+(-53)]

0+(-300)

= -300             

d)13.70-50 [(19-3²):2+2³]

=13.70-50[10:2+8]

=13.70-50.13

=13.(70-50)

=13.20

=260

2.

a)x-36:18=12-5   

    x-36:18=6

    x-36=6.18   

     x-36=108

      x=108+36

      x=    144                    

b)92-(17+x)=72

17+x=92-72

17+x=20

x=20-17

x=3

c)720:[41-(2x+5)]=40     

41-(2x+5)=720:40

41-(2x+5)=  18

2x+5=41-18

2x+5=23

2x=23-5

2x=18

x=18:2

x=9                 

d) (x+2)³ -23=41

 (x+2)³ =41+23

 (x+2)³ =64

=> (x+2)³ =4³

=>x+2=4

=>x=4-2

=>x=2

52.298

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bn sai bét r

14 - 23 + (-17) - 92

= 14 - 23 - 17 - 92

= -9 - 17 - 92

= -26 - 97

= -123

14 - 23 + ( - 17 ) - 92

= 14 - 23 - 17 - 92

= - 9 - 17 - 92

= - 26 - 97

= - 123

14-23+(-17)-92=-118

\(\frac{36}{47}-\frac{92}{29}-\frac{36}{47}+\frac{90}{29}\)

\(=\left(\frac{36}{47}-\frac{36}{47}\right)+\left(\frac{-92}{29}+\frac{90}{29}\right)\)

\(=0+\frac{-2}{29}\)

\(=\frac{-2}{29}\)

a, 83:25+38:25 = 25*(83+38)

                         = 25 *     121

                         =   3025

b, 92 : 36 - 29 : 36 = 36 * ( 92 - 29 )

                               =  36 *      63

                               =       2268

a)83:25+38:25=(83+38):25

                       =121:25=4,84

b)92:36-29:36

=(92-29):36

=63:36=1,75

a) 83:25+38:25

=3,32 +1,25

=4,57

b) 92 :36 -29:36=1,75