Tính:
a) (37-17).(-5)+23.(-13-17);
b) (-57).(67-34)-67.(34-57)
Có cách giải nha , ai giải được tui tick cho
Tính:
a, (-22) + (-14) =
b, (-17) + (-29) + (-61) =
c, (-37) + (-16) + (-4) + (-13) =
d, (-47)+ (-16)+ (-23) + (-4) =
Tính: (37 - 17).(-5) + 23.(-13 - 17)
(37 – 17) . (–5) + 23 . (–13 – 17)
= 20 . (–5) + 23. (–30)
= (–100) + (–690) = –790.
Tính:
a, \(\dfrac{3}{5}+\dfrac{-4}{9}\) b, \(\dfrac{3}{5}+\dfrac{2}{5}.\dfrac{15}{8}\)
c, \(\dfrac{7}{2}.\dfrac{8}{13}+\dfrac{8}{13}.\dfrac{-5}{2}+\dfrac{8}{13}\)
d, \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}\)
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) \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}=\dfrac{9}{23}.\left(\dfrac{-5}{17}+\dfrac{-22}{17}\right)=\dfrac{-243}{391}\)
(37-17).(-5)+23.(-13-17)=
(37-17) . (-5) + 23 . (-13 - 17)
\(\left(37-17\right)\cdot\left(-5\right)+23\cdot\left(-13-17\right)\)
\(=20\cdot\left(-5\right)+23\cdot\left(-30\right)\)
\(=-100+-690=-790\)
Bài 1: Tính hợp lý
1) - 5 x ( 37 - 17 ) + 23 x ( - 13 - 17 )
2) - 37 x ( 55 - 23 ) + 55 x ( 23 - 37 )
Tính:
a, (-17)+23+77+17 b, 60+45+(-15)+(-45)
c, (-3)+(-185)+(-17)+185 d, (-3)+(-4)+66+(-13)
(37-17)×(-5)+23×(-13-17)
(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
tính :
(37-17).(-5)+23.(-13-17)
( 37 - 17 ) . ( - 5 ) + 23 . ( - 13 - 17 )
= 20 . ( - 5 ) + 23 . ( - 30 )
= ( - 100 ) + ( - 690 )
= ( - 790 )