62 : 4 . 3 + 2 . 52

= 36 : 4 . 3 + 2 . 25

= 9 . 3 + 50 = 27 + 50

= 77

Phân tích ra thừa số nguyên tố: 77 = 11 x 7

(Bạn nào ra kết quả 53 là sai do nguyên tắc thực hiện phép tính chỉ có phép nhân và chia thì thực hiện từ trái qua phải)

a) \(3.5^2+15.2^2-26\div2\)

= 3.25 + 15.4 - 13

= 75 + 60 - 13

= 135 - 13

= 122

b) \(5^3.2-100\div4+2^3.5\)

= 125.2 - 25 + 8.5

= 250 - 25 + 40

= 225 + 40

= 265

c)\(6^2\div9+50.2-3^3.33\)

= 36 : 9 + 100 - 9.33

= 4 + 100 - 297

= 104 - 297

= -193

d)\(3^2.5+2^3.10-81\div3\)

= 9.5 + 8.10 - 27

= 45 + 80 - 27

= 125 - 27

= 98

e) \(5^{13}\div5^{10}-25.2^2\)

= 5³ - 25.4

= 125 - 100

= 25

f) \(20\div2^2+5^9\div5^8\)

= 20 : 4 + 5

= 5 + 5

= 10

\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)

a: 5A=5+5^2+...+5^2023

=>4A=5^2023-1

=>A=(5^2023-1)/4

b: 6B=6^2+6^3+...+6^41

=>5B=6^41-6

=>B=(6^41-6)/5

c: 16C=4^4+4^6+...+4^16

=>15C=4^16-4^2

=>C=(4^16-4^2)/15

d: 9D=3^3+3^5+...+3^27

=>8D=3^27-3

=>D=(3^27-3)/8

8: =>2x=210

hay x=105

???????????????????????????

nope :v