Ta có \(\frac{-17}{30}-\frac{-11}{15}-\frac{7}{12}\)

\(=\frac{-17}{30}+\frac{11}{15}-\frac{7}{12}\)

\(=\left(\frac{-17}{30}+\frac{22}{30}\right)-\frac{7}{12}\)

\(=\frac{1}{6}-\frac{7}{12}=\frac{2}{12}-\frac{7}{12}=-\frac{5}{12}\)

1/7x-x=5²¹:5¹⁹+3.2²-7⁰

6x=5²+3.4-1

6x=25+12-1

6x=25+11

6x=36

x=36:6

x=3

2/7x-2x=6¹⁷:6¹⁵+44:11

5x=6²+4

5x=36+4

5x=40

x=40:5

x=8

3/6x+x=5¹¹:5⁹+3

7x=5²+3

7x=25+3

7x=28

x=28:7

x=4

a)  7x - x = 5²¹: 5¹⁹ + 3.2² - 7⁰

         6x  =    5²      + 3. 4 - 1

         6x  =    25       + 12 - 1

         6x =           37        -  1

         6x =                 36

          x  =  36 : 6

          x = 6

b) 7x - 2x = 6¹⁷ : 6¹⁵ + 44:11

       5x     =    6²       + 4

        5x     =  36        +4 

        5x      = 40

        x        = 40 :5

        x        = 8

c) 6x + x = 5¹¹ : 5⁹ + 3

         7x  =    5²     +3

          7x  =  25      +3

           7x  =    28

            x   = 28 : 7

             x  = 4

Bạn ơi, 36 chia 6 bằng 3 thì đúng sao được

\(\frac{12}{7}\times\frac{2}{11}+\frac{12}{11}\times\frac{15}{7}-\frac{12}{7}\times\frac{6}{11}\)

\(=\frac{12}{7}\times\frac{2}{11}+\frac{12}{7}\times\frac{15}{11}-\frac{12}{7}\times\frac{6}{11}\)

\(=\frac{12}{7}\times\left(\frac{2}{11}+\frac{15}{11}-\frac{6}{11}\right)\)

\(=\frac{12}{7}\times1=\frac{12}{7}\)

\(\frac{12}{7}.\frac{2}{11}+\frac{12}{11}.\frac{15}{7}-\frac{12}{7}.\frac{6}{11}\)

= \(\frac{24}{77}\)+\(\frac{180}{77}\)-\(\frac{72}{77}\)

=\(\frac{132}{77}\)

\(\frac{12}{7}\cdot\frac{2}{11}+\frac{12}{11}\cdot\frac{15}{7}-\frac{12}{7}\cdot\frac{6}{11}\)

\(=\frac{12}{7}\cdot\frac{2}{11}+\frac{12}{7}\cdot\frac{15}{11}-\frac{12}{7}\cdot\frac{6}{11}\)

\(=\frac{12}{7}\cdot\left(\frac{2}{11}+\frac{15}{11}-\frac{6}{11}\right)\)

\(=\frac{12}{7}\cdot1\)

\(=\frac{12}{7}\)

\(\frac{\left(23,4+15,5\right)\cdot7+\left(23,4+19,5\right)\cdot3+11}{0,55\cdot2\cdot30+5\cdot11+2,75\cdot8}\)

\(=\frac{\left(23,4+15,5\right)\cdot\left(7+3\right)+12+11}{1,1\cdot30+5\cdot11+11\cdot2}\)

\(=\frac{38,9\cdot10+23}{11\cdot\left(3+5+2\right)}=\frac{412}{110}=\frac{206}{55}\)

Chúc em học tốt!

(Mong em đừng đăng câu hỏi linh tinh lên nữa)
 

c= - 1/10 nha

11+12+13+14+15+16+17+18+19=135

10+20+30+40+50+60+70+80+90=450

1+2+3+4+5+6+7+8+9=45

135

450

45

135

450

45

kb nha

3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72

=1.5-0.8(3)+0.58(3)-0.3(6)-0.3(095238)+0.267(857142)-0236(1)

=0.(8)

3/2 - 5/6 + 7/12 - 9/20 + 11/30 - 11/42 + 15/56 - 17/72  = -3923/1260 ( Đay là cách nhanh nhất bằng cách sử dụng CASIO ) khakha Đoàn Lê Bảo Ngọc

Đề sai nhé: \(-\frac{7}{12}\)

m= 3/2-5/(2*3)+7/(3*4)-9/(5*4)+11/(5*6).........-17/(8*9)

= 3/2-5/2+5/3+7/3-7/4-9/4+9/5+11/5-11/6-13/6+13/7+15/7-15/8-17/8+17/9

=-1+4-15/4+5-4+4-4+17/9

=4-15/4+17/9 

làm kiểu thế này. mình k có thời gian nên có thể tính sai đó bạn tính lại nhé

\(\frac{-34}{60}+\frac{44}{60}-\frac{35}{60}\)

\(\frac{-34+44-35}{60}=-\frac{5}{12}\)

\(\frac{-17}{30}+\frac{11}{15}-\frac{7}{12}=\frac{-34}{60}+\frac{44}{60}-\frac{35}{60}\)

\(=\frac{-34+44-35}{60}\)

\(\frac{-5}{12}\)

\(\frac{-17}{30}+\frac{11}{15}-\frac{7}{12}\)

\(=\frac{-34+44-35}{60}\)

\(=\frac{-25}{60}=\frac{-5}{12}\)