-4/11+5/6+7/11-5/6

=(-4/11+7/11)+(5/6-5/6)

=3/11+0

=3/11

Làm là giúp đủ 3 câu hộ mình. 1 câu k k đâu !

3/7*(0,5+11/2)-2/7:25%

=3/7*(0,5+11/2)-2/7:1/4

=3/7*(0,5+11/2)-2/7*4

=3/7*(1/2+11/2)-2/7*4

=3/7*6-2/7*4

=18/7-8/7

=10/7

a) (137x25-25x37):10

=25x(137-37):10

=25x100:10

=2500:10

=250

b) 2/7x21/4-2/7:13/4

=2/7x21/4-2/7x4/13

=2/7x(21/4-4/13)

=2/7x257/52

=257/182

c)(124x237+152):(870+235x122)

=(29388+152):(870+28670)

=29540:29540

=1

a) (137 x 25 - 25 x 37 ) : 10 = (25 x (137 - 37) ) : 10

                                       = (25 x 100) : 10

                                       = 2500 : 10

                                       = 250

a)=(3425-925):10

=25200:10

=250

b)=3/2-8/91

=257/182

c)=(29388+152):(870+28670)

=29540:29540

=1

d)=1161+1539/72

=2700/72=75/2

e)=10/77+45/77x9/7

=10/77+405/539

=475/539

li ke cho mình nha Lam Le thi

a) \(\dfrac{7}{30}+\dfrac{\left(-12\right)}{37}+\dfrac{23}{30}+\dfrac{\left(-25\right)}{37}=\left(\dfrac{7}{30}+\dfrac{23}{30}\right)+\left(\dfrac{-12}{37}+\dfrac{-25}{37}\right)=1+\left(-1\right)=0\)

b) \(\dfrac{5}{7}\cdot\dfrac{5}{11}+\dfrac{5}{7}\cdot\dfrac{2}{11}-\dfrac{5}{7}\cdot\dfrac{14}{11}=\dfrac{5}{7}\cdot\left(\dfrac{5}{11}+\dfrac{2}{11}-\dfrac{14}{11}\right)=\dfrac{5}{7}\cdot\left(-\dfrac{7}{11}\right)=-\dfrac{5}{11}\)

c) \(\dfrac{\left(-5\right)}{7}\cdot\dfrac{3}{13}-\dfrac{5}{7}\cdot\dfrac{10}{13}+1\dfrac{5}{7}=\dfrac{5}{7}\cdot\dfrac{-3}{13}-\dfrac{5}{7}\cdot\dfrac{10}{13}+\dfrac{12}{7}=\dfrac{5}{7}\cdot\left(\dfrac{-3}{13}-\dfrac{10}{13}\right)+\dfrac{12}{7}=\dfrac{5}{7}\cdot\left(-1\right)+\dfrac{12}{7}=\left(-\dfrac{5}{7}\right)+\dfrac{12}{7}=\dfrac{7}{7}=1\)

#)Trả lời :

a)   \(\frac{-1}{2}+\frac{2}{7}-\frac{5}{28}\)

    \(=\frac{-3}{14}-\frac{5}{28}\)

    \(=\frac{-11}{28}\)

b)  \(5\frac{3}{4}+\left(\frac{1}{9}-1\frac{3}{4}\right)\)

   \(=\left(5\frac{3}{4}-1\frac{3}{4}\right)+\frac{1}{9}\)

   \(=4+\frac{1}{9}\)

   \(=4\frac{1}{9}=\frac{37}{9}\)

c)  \(\frac{-5}{7}x\frac{2}{11}+\frac{-5}{7}x\frac{9}{11}+3\frac{5}{7}\)

   \(=\frac{-5}{7}x\left(\frac{2}{11}+\frac{9}{11}\right)+3\frac{5}{7}\)

   \(=\frac{-5}{7}x1+3\frac{5}{7}\)

   \(=\frac{-5}{7}+3\frac{5}{7}\)

   \(=\frac{-5}{7}+\frac{26}{7}\)

   \(=\frac{21}{7}=3\)

            #~Will~be~Pens~#

a: =308-117

=191

(6:3/5-7/6×6/7) : (21/5×10/11+57/11)

=(10-1):(42/11+57/11)

=9:9

=1

(6:3/5-7/6x6/7):(21/5x10/11+57/11)

= (10-1):(42/11+57/11)

=9:9

=1

~~~~ Hoc tot ~~~~~

a) 2 + 4 + 6 + ... + 100 

\(=\frac{\left[\left(100-2\right):2+1\right].\left(100+2\right)}{2}=2550\)

b) 1 + 3 + 7 + ... + 99 

\(=\frac{\left[\left(99-1\right):2+1\right].\left(99+1\right)}{2}=2500\)

c) 1 + 5 + 9 + 13 + ... + 49 

\(=\frac{\left[\left(49-1\right):4+1\right].\left(49+1\right)}{2}=325\)

Cho minh hoi so 2 duoi co nghia là răng bạn

Ban nay lam sai roi

\(\dfrac{2}{7}\cdot\dfrac{2}{11}+\dfrac{5}{7}\cdot\dfrac{12}{11}-\dfrac{5}{7}\cdot\dfrac{7}{11}\)

\(=\dfrac{4}{77}+\dfrac{5}{7}\left(\dfrac{12}{11}-\dfrac{7}{11}\right)\)

\(=\dfrac{4}{77}+\dfrac{5}{7}\cdot\dfrac{5}{11}=\dfrac{4}{77}+\dfrac{25}{77}=\dfrac{29}{77}\)

p/s: toán 6