=-129-171+137-37

=-300+100

=-200

=1987x(54-37)-987x(37-

91000

=1987 x (54 + 37) - 987 x (37 + 54)

= (1987 - 987) x 91

= 1000 x 91

= 91000

23/27

19/23 x 23/37 x 37/19

= 37/27

\(\dfrac{1919}{2323}\times\dfrac{464646}{747474}\times\dfrac{37}{19}\)

\(=\)\(\dfrac{1919:101}{2323:101}\times\dfrac{464646:10101}{747474:10101}\times\dfrac{37}{19}\)

\(=\dfrac{19}{23}\times\dfrac{46}{74}\times\dfrac{37}{19}\)

\(=\dfrac{19\times23\times2\times37}{23\times2\times37\times19}=1\)

= 19/23 x 23/37 x 37/19

= 19/37 x 37/19

= 1

0,37 + 37/50 + 26% + 63/100

= 37/100 + 37/50 + 13/50+ 63/100

= ( 37/100 + 63/100 ) + ( 37/50+ 13/50 ) 

=                  1           +         1

=                                  2

= (0,37 + 63/100) + ( 37/50+ 26%)

= 1+1

=2

0,37 + 37/50 +26% +63/100

=37/100 + 74/100 +26% +63%

=37% + 74% +26% + 63%

=(37% + 63%) +(26% +74%)

=100% + 100%

=200% 

                                                                    MIK NHA !!!!!!!!!!!!!

Trong sách bài tập toán đó bạn !!

a, 15.27 - 3.5.17

= 15.27 - 15. 17

= 15 . ( 27 - 17 )

​= 15 . 10

= 150

​b, 55 - 5 . ( 20 + 11 )

​= 55 - 100 . 55

​= 55 . ( 1 - 100 )

​= 55 . ( -99 )

= ...

a,15.27-3.5.17

=15.27-15.17

=15(27-17)

=15.10=150

b,55-5(20+11)

=5.11-5.20-5.11

=5(11-20-11)

=5.(-20)=-100

c,37(29-23)-29(37-23)

=37.29-37.23-29.37+29.23

=37.29-29.37-37.23+29.23

=0+(-37+29).23

=-8.23=-184

a 15.27-3.5.7=15.27-15.7=15.(27-7)=15.20=300

b 55-5(20+11)=55-5.20+5.11=55-100+55=55.2-100=10

c 37.(29-23)-29.(37-23)=37.29-37.23-29.37-29.23=37.(29-29)-23.(37-29)=0-23.8=0-184=(-184)

tick đúng mình nha làm ơn bạn đó bạn ko tick mình thì bạn sẽ xui cả năm

a, =15.27-15.7

=15.20=300

b,=5.11-5.20-5.11

=5(11-20-11)

=5(-20)=-100

c,=37.29-37.23-29.37+29.23

=37.29-29.37-37.23+29.23

=0+(-37+29).23

=-8.23=-184

A 15.27-15.7

=15.(27-7)

=15.20

=300

B 55-5.(20+11)

=55-5.31

=55-155

=-100

C)37.(29-23)-29.(37-23)

=37.6-29.14

=222-406

=-184

37(29-23)-29(37-23)

=37.29-37.23-37.29+29.23

=(37.29-37.29)-(37.23-29.23)

=-23(37-29)

=-23.8

=-184