-15.(23 – 29) + 23.(15 – 29) 37.(27 + 25) – 27.(47 + 25) 05/07/2021 Bởi Emery -15.(23 – 29) + 23.(15 – 29) 37.(27 + 25) – 27.(47 + 25)
-15.(23 – 29) + 23.(15 – 29) = -15.23 +15.29 +23.15 -23.29 = 15.(23-23) +29.(15 -23) = 15.0 + 19.(-8) = 0 + (-152) = -152 37.(27 + 25) – 27.(47 + 25) = 37.27 +37.25 -27.47 -27.25 = 27.(37 -47) +25.(37-27) = 27.(-10) + 25.10 = -270 + 250 = -20 Bình luận
a) $-15.( 23 – 29 ) + 23 (15 – 29 )$ $= -15.23 + 15.29 + 23.15 – 23.29$$= ( -15.23 + 23.15 ) + ( 15.29 – 23.29 )$$= 23(-15+15) + 29(15 – 23 ) $$= 29 . ( -8 ) $$= -232$ b) $37.(27+25 ) – 27(47 + 25 ) $$= 37.27 + 37.25 – 27.47 – 27.25$$=( 37.27 – 27.47 ) + ( 37.25 – 27.25)$$= 27(37-47) +25(37-27)$$= 27.( -10 ) + 25.10$$= -10(27 – 25 ) $$= -10 . 2$$= -20$ Bình luận
-15.(23 – 29) + 23.(15 – 29) = -15.23 +15.29 +23.15 -23.29
= 15.(23-23) +29.(15 -23)
= 15.0 + 19.(-8)
= 0 + (-152)
= -152
37.(27 + 25) – 27.(47 + 25) = 37.27 +37.25 -27.47 -27.25
= 27.(37 -47) +25.(37-27)
= 27.(-10) + 25.10
= -270 + 250
= -20
a) $-15.( 23 – 29 ) + 23 (15 – 29 )$
$= -15.23 + 15.29 + 23.15 – 23.29$
$= ( -15.23 + 23.15 ) + ( 15.29 – 23.29 )$
$= 23(-15+15) + 29(15 – 23 ) $
$= 29 . ( -8 ) $
$= -232$
b) $37.(27+25 ) – 27(47 + 25 ) $
$= 37.27 + 37.25 – 27.47 – 27.25$
$=( 37.27 – 27.47 ) + ( 37.25 – 27.25)$
$= 27(37-47) +25(37-27)$
$= 27.( -10 ) + 25.10$
$= -10(27 – 25 ) $
$= -10 . 2$
$= -20$