Lời giải:

a. 

$=5^{6-3}+2^{3-2}=5^3+2^1=125+2=127$
b.

$=3333:3+225:15=1111+15=1126$

c.

$=15.2^3+4.3^2-5.7=15.8+4.9-35=120+36-35=120+1=121$

d.

$=5.4^2-18:3^2=5.16-18:9=80-2=78$

e.

$=6^2:4.3+2.5^3=36:4.3+2.125$

$=9.3+250=27+250=277$

f.

$=80-(4.25-3.8)=80-(100-24)=80-100+24=-20+24=4$

123-5.(x+4)=38

5.(x+4)=123-38

5.(x+4)=85

x+4=85:5

x+4=17

x=17-4

x=13

(3.x-2^4).7^3=2.7^4

(3.x-16).343=2.2401

(3.x-16).343=4802

3.x-16=4802:343

3.x-16=14

3.x=14+16

3.x=30

x=30:3

x=10

6^2:4.3+2.5^2

=36:4.3+2.25

=9.3+2.25

=27+50

=77

5.4^2-18:3^2

=5.16-18:9

=80-2

=78

80-(4.5^2-3.2^3)

=80-(4.25-3.8)

=80-(100-24)

=80-76

=4

23.75+25.23+180

=23.(75+25)+180

=23.100+180

=2300+180

=2480

2448:[119-(23-6)]

=2448:(119-17)

=2448:102

=24

(2600+6400)-3.x=1200

9000-3.x=1200

3.x=9000-1200

3.x=7800

x=7800:3

x=2600

[(6.x-72):2-84].28=562

(6.x-72):2-84=562:28

(6.x-72):2-84=281/14

(6.x-72):2=281/14+84

(6.x-72):2=1457/14

6.x-72=1457/14.2

6.x-72=1457/7

6.x=1457/7+72

6.x=1961/7

x=1961/7:6

x=1961/42

5.4² - 18 : 3² . 2²+2.1¹⁵ = 5 .2⁴  - 2.3²:3².2²+2 

                                      = 5 . 2⁴ - 2³ + 2

                                     = 5 . 10 = 50

80- (4.5²-3.2³) = 2⁴ . 5 - 2² .5² + 3 .2³

                     = 2² ( 2² .5-5+ 3.2)

                    = 4 . 21 = 84

\(a.6^2:4.3+2.5^2=36:4.3+2.25=9.3+50=27+50=77\)

\(b.2.\left(5.4^2-18\right)=2.\left(5.16-18\right)=2.\left(80-18\right)=2.62=124\)

a, =  36 : 4 + 2 . 25 

= 9 + 50

=  59 

b , = 5 . 16 - 18 : 9

= 80 - 2 

78

a, =  36 : 4 + 2 . 25 

= 9 + 50

=  59 

b , = 5 . 16 - 18 : 9

= 80 - 2 

78

Câu hỏi 1:=111+1

=>112

Câu hỏi 2:=27+50

=>77

Câu hỏi 3:80-2

=>78

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