a) =-36

b)=-107

c)=-70

d) =-90

Thank you  :)))

(37 – 17) . (–5) + 23 . (–13 – 17)

= 20 . (–5) + 23. (–30)

= (–100) + (–690) = –790.

a: =27/45-20/45=7/45

b: \(=\dfrac{3}{5}+\dfrac{30}{40}=\dfrac{3}{5}+\dfrac{3}{4}=\dfrac{12}{20}+\dfrac{15}{20}=\dfrac{27}{20}\)

c: \(=\dfrac{8}{13}\left(\dfrac{7}{2}-\dfrac{5}{2}+1\right)=\dfrac{8}{13}\cdot2=\dfrac{16}{13}\)

d: \(=\dfrac{9}{23}\left(\dfrac{5}{17}-\dfrac{22}{17}\right)+11+\dfrac{9}{23}=11\)

a) \(\dfrac{3}{5}+\dfrac{-4}{9}=\dfrac{27}{45}+\dfrac{-20}{45}=\dfrac{7}{45}\)

b) \(\dfrac{3}{5}+\dfrac{2}{5}.\dfrac{15}{8}=1.\dfrac{15}{8}=\dfrac{15}{8}\)

c) \(\dfrac{7}{2}.\dfrac{8}{13}+\dfrac{8}{13}.\dfrac{-5}{2}+\dfrac{8}{13}=\dfrac{8}{13}.\left(\dfrac{7}{2}+\dfrac{-5}{2}\right)=\dfrac{8}{13}.1=\dfrac{8}{13}\)

d) \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}=\dfrac{9}{23}.\left(\dfrac{-5}{17}+\dfrac{-22}{17}\right)=\dfrac{-243}{391}\)

=20*(-5)+23*(-30)

= -100-690

= -790

\(\left(37-17\right)\cdot\left(-5\right)+23\cdot\left(-13-17\right)\)

\(=20\cdot\left(-5\right)+23\cdot\left(-30\right)\)

\(=-100+-690=-790\)

a, 100   b, 45   c, -20   d, 46.

a,100

b,45

c,-20

d,46

(37-17)x(-5)+23x(-13-17)

=20x(-5)+23x(-13-17)

=-100+23x(-13-17)

=-100+(-690)

=-790

Cách làm và đáp án chính xác và nhanh nhất đó, tick nhé !

(37 – 17) . (–5) + 23 . (–13 – 17)

= 20 . (–5) + 23. (–30)

= (–100) + (–690) = –790

 

( 37 - 17 ) . ( - 5 ) + 23 . ( - 13 - 17 )

= 20 . ( - 5 ) + 23 . ( - 30 )

= ( - 100 ) + ( - 690 )

= ( - 790 ) 

-790 nhớ chọn cho mk nha