\(\dfrac{19}{28}+\dfrac{23}{47}-\dfrac{15}{8}+\dfrac{9}{28}+\dfrac{24}{47}\)

\(=\left(\dfrac{19}{28}+\dfrac{9}{28}\right)+\left(\dfrac{23}{47}+\dfrac{24}{47}\right)-\dfrac{15}{8}\)

\(=\dfrac{28}{28}+\dfrac{47}{47}-\dfrac{15}{8}\)

\(=1+1-\dfrac{15}{8}\)

\(=\dfrac{1}{8}\)

____________________

\(\dfrac{30}{11}+\dfrac{12}{35}-\dfrac{19}{11}-\dfrac{2}{35}-\dfrac{2}{7}\)

\(=\left(\dfrac{30}{11}-\dfrac{19}{11}\right)+\left(\dfrac{12}{35}-\dfrac{2}{35}\right)-\dfrac{2}{7}\)

\(=\dfrac{11}{11}+\dfrac{10}{35}-\dfrac{2}{7}\)

\(=1+\dfrac{2}{7}-\dfrac{2}{7}\)

\(=1\)

 = 19/37 - 19/37 + 1

= 0/37 + 1

= 0/37 + 37/37

=1

1 + 19/37 - 19/37

1 + 0 = 1

Lời giải chi tiết:

1

minh tra loi dau tien day nhe

19/37+(1-19/37)

=19/37+18/37

=37/37=1

tích mink mink tích lại

19/37+(1-19/37)

=1+(19/37-19/37)

=1+0=1

\(\left(\dfrac{18}{37}+\dfrac{19}{37}\right)+\left(\dfrac{8}{24}-\dfrac{47}{24}\right)+\dfrac{2}{3}=\dfrac{37}{37}-\dfrac{13}{8}+\dfrac{2}{3}=\dfrac{1}{24}\)

d) -37 . (-19) + 37 . (-119)

= -37.(-19 + 119)

= -37 . 100

= -3700

4750/1000 + 370/1000 + 5280/1000 + 2500/1000 + 37/12 = 129/10 + 37/12 = 959/60 

1933/120 nha bạn

=19\37-(19\37-15\37)

=19\37-19\37+15\37

=(19\37-19\37)+15\37

=15\37

`(87-37 ) : (-5) + ( 19-26 ) . (-3)^2`

`=50 :(-5) + (-7).9`

`= -10+  (-7).9`

`= -10+ (-63)`

`=-73`

(87 - 37) : ( -5) + ( 19-26).(-3)²

50 : (-5) + -7 . 9

= -10 - 63

= -( 10 + 63)

= -73