Hướng dẫn:

• Để có kết quả phép tính 2*5 (2 nhân với 5), trong ngăn nhập lệnh em gõ:

PR 2*5

• hoặc:

SHOW 2*5

• Sau đó nhấn phím Enter hoặc nháy nút Excute

Kết quả:

a, theo đề ra ta có:

= -12/23 + (-1 )

= -35/23

b, theo đề ra ta có:

= 85.8 - 35.58

= 680 - 2030

= - 1350

/là dấu j

34 + 26 = 60                      60 – 34 = 26

26 + 34 = 60                      60 – 26 = 34

28 + 12 = 40                      40 – 28 = 12

12 + 28 = 40                      40 – 12 = 28

34 + 26 = 60              60 – 34 = 26

26 + 34 = 60              60 – 26 = 34

28 + 12 = 40              40 – 12 = 28

12 + 28 = 40              40 – 28 = 12

42

42

42

\(\left(\sqrt{32}-\sqrt{50}+\sqrt{27}\right)\left(\sqrt{27}+\sqrt{50}-\sqrt{32}\right)\\ =\left(4\sqrt{2}-5\sqrt{2}+3\sqrt{3}\right)\left(3\sqrt{3}+5\sqrt{2}-4\sqrt{2}\right)\\ =\left(-\sqrt{2}+3\sqrt{3}\right)\left(3\sqrt{3}+\sqrt{2}\right)\\ =\left(3\sqrt{3}-\sqrt{2}\right)\left(3\sqrt{3}+\sqrt{2}\right)\\ =\left(3\sqrt{3}\right)^2-\left(\sqrt{2}\right)^2=9.3-2=25\)

\(\left(\sqrt{32}-\sqrt{50}+\sqrt{27}\right)\left(\sqrt{27}+\sqrt{50}-\sqrt{32}\right)\)

\(=\left(4\sqrt{2}-5\sqrt{2}+3\sqrt{3}\right)\left(3\sqrt{3}+5\sqrt{2}-4\sqrt{2}\right)\)

\(=\left(3\sqrt{3}-\sqrt{2}\right)\left(3\sqrt{3}+\sqrt{2}\right)=\left(3\sqrt{3}\right)^2-\sqrt{2}^2\)

\(=9.3-2=27-2=25\)

(\(\sqrt{32}-\sqrt{50}+\sqrt{27}\))(\(\sqrt{27}+\sqrt{50}-\sqrt{32}\))

= \(\left(4\sqrt{2}-5\sqrt{2}+3\sqrt{3}\right)\)\(\left(3\sqrt{3}+5\sqrt{2}-4\sqrt{2}\right)\)

= \(\left(3\sqrt{3}-\sqrt{2}\right)\)\(\left(3\sqrt{3}+\sqrt{2}\right)\)

= \(\left(3\sqrt{3}\right)^2-\left(\sqrt{2}\right)^2\)

= 27 - 2 = 25

\(\left(\sqrt{32}-\sqrt{50}+\sqrt{27}\right)\left(\sqrt{27}+\sqrt{50}-\sqrt{32}\right)\)

\(=\left(4\sqrt{2}-5\sqrt{2}+3\sqrt{3}\right)\left(3\sqrt{3}+5\sqrt{2}-4\sqrt{2}\right)\)

\(=\left(3\sqrt{3}-\sqrt{2}\right)\left(3\sqrt{3}+\sqrt{2}\right)\)

\(=27-2\)

\(=25\)

\(\left(\sqrt{32}-\sqrt{50}+\sqrt{27}\right)\left(\sqrt{27}+\sqrt{50}-\sqrt{32}\right)\)

\(\Leftrightarrow\left(4\sqrt{2}+3\sqrt{3}-5\sqrt{2}\right)\left(\sqrt{27}+\sqrt{50}-\sqrt{32}\right)\)

\(\Leftrightarrow\left(4\sqrt{2}+3\sqrt{2}-5\sqrt{2}\right)\left(3\sqrt{3}+5\sqrt{2}-4\sqrt{2}\right)\)

\(\Leftrightarrow\left(3\sqrt{3}-\sqrt{2}\right)\left(3\sqrt{3}+5\sqrt{2}-4\sqrt{2}\right)\)

\(\Leftrightarrow\left(3\sqrt{3}-\sqrt{2}\right)\left(3\sqrt{3}+2\right)\)

\(\Leftrightarrow\left(3\sqrt{3}\right)^2-\left(\sqrt{2}\right)^2\)

\(\Rightarrow25\)

Vậy: BT = 25

P/s: từ dòng thứ 2 trở xuống bạn tự phân ... Vấn đề là ở bạn thôi :)))

\(=\left(\sqrt{27}\right)^2-\left(\sqrt{50}-\sqrt{32}\right)^2\)

\(=27-2=25\)

a. = 23 . (55-45) + 230

    = 23 . 10 +230

    = 230 + 230

    = 460

b. = 71 . (66 - 41 - 1)

    = 71 . 24

    = 1704

c. = 50 . (11 + 22) - 100

    = 50 . 33 - 100

    = 1650 - 100

    = 1550

d. = 27. (54 - 50) + 50

    = 27 . 4 + 50

    = 108 + 50

    = 158

a) 23.55-45.23+230

    =23.(55-45)+230

    =23.10+230

    =230+230

    =460

b) 71.66-41.71-71

    =71.(66-41-1)

    =71.24

    =1704

c) 11.50+50.22-100

   =50.(11+22)-100

   =50.33-100

   =1550

d) 54.27-27.50+50

   =27.(54-50)+50

   =27.4+50

   =108+50

   =158

# Bé_Bông #

a, 23 . 55 -45 . 23 + 230

    23 . ( 55 - 45) + 230

    23 . 10 + 230

    230 + 230

    4600

b, 71 . 66 - 41 . 71  - 71

   71 . ( 66 - 71 - 1)

   71 . ( -4)

   -248

c, 11 . 50 + 50 . 22 - 100

    11 . ( 50 + 50 ) - 100

    11 . 100 - 100

    1100 - 100

    1000

d, 54 . 27 - 27 . 50 + 50

   27 . ( 54 - 50 ) + 50

   27 . 4 + 50

   108 + 50

   158

tck mk nhé

thank you

=116

= 116

\(= 116\)

a) `27 .75 + 25.27 -150`

`=27 xx (75 + 25)-150`

`=27 xx 100-150`

`=2700-150`

`=2550`

b) `142-[50-(2^3 .10-2^3 .5)]`

`=142-[50-2^3 .(10-5)]`

`=142-(50-8 .5)`

`=142-(50-40)`

`=142-10`

`=132`

c) `375:{32-[4+(5.3^2-42)]}-14`

`=375:{32-[4+(45-42)]}-14`

`=375:[32-(4+3)]-14`

`=375: 25 -14`

`=15-14`

`=1`

a. 27 . 75 + 25 . 27 - 150

= 27. (75 + 25) - 150

= 27 . 100 - 150

= 2700 - 150

= 2550

b. 142 - [50 - (2³.10 - 2³.5)]

= 142 - [50 - (8 . 10 - 8 . 5)]

= 142 - {50 - [8 . (10 - 5)]} 

= 142 - (50 - 40)

= 142 - 10

= 132

c. 375 : {32 – [ 4 + (5. 3² – 42)]} – 14

= 375 : {32 – [ 4 + (5. 9 – 42)]} – 14

= 375 : {32 – [ 4 + (45 – 42)]} – 14

= 375 : {32 – [ 4 + 3]} – 14

= 375 : {32 –7} – 14

= 375 : 25 - 14

= 15 - 14

= 1