a, 57 . (47 – 74 ) + 47 . (74 – 54) b, 15 . (-27 + 30 ) -27 . (30 – 15) -30 . (5 – 27 ) 10/11/2021 Bởi Adalynn a, 57 . (47 – 74 ) + 47 . (74 – 54) b, 15 . (-27 + 30 ) -27 . (30 – 15) -30 . (5 – 27 )
$57.(47-74)+47.(74-54)$ $=57 . 47 – 74 + 47 . 74 – 54$ $=2679 – 74 + 3478 – 54$ $=2605 + 3478 – 54$ $=6083 – 54$ $=6029$ $15 . (-27 + 30 ) -27 . (30 – 15) -30 . (5 – 27 )$ $=15 . (-27) + 30 – 27.30-15-30.5-27$ $=(15-15)+(27-27)+(30-30)-27.5$ $=0+0+0-27.5$ $=0+0+0-135$ $=-135$ Bình luận
a) 57 . ( 47 -74 ) + 47 . ( 74 – 54 ) = 57 .47 -74 + 47 . 74 – 54 = 2679 -74 + 3478-54 = 2605 + 3478 – 54 = 6083-54 = 6029 b) 15 .( – 27 + 30 – 27 . ( 30 – 15 ) – 30 . ( 5 -27 ) = 15 . (-27 ) + 30 – 27 . 30 -15 – 30 .5 -27 =(15-15) + ( 27-27) + ( 30 – 30 ) – 27 .5 =0 + 0 + 0 .135 = 0 – 135 = -135 Bình luận
$57.(47-74)+47.(74-54)$
$=57 . 47 – 74 + 47 . 74 – 54$
$=2679 – 74 + 3478 – 54$
$=2605 + 3478 – 54$
$=6083 – 54$
$=6029$
$15 . (-27 + 30 ) -27 . (30 – 15) -30 . (5 – 27 )$
$=15 . (-27) + 30 – 27.30-15-30.5-27$
$=(15-15)+(27-27)+(30-30)-27.5$
$=0+0+0-27.5$
$=0+0+0-135$
$=-135$
a) 57 . ( 47 -74 ) + 47 . ( 74 – 54 )
= 57 .47 -74 + 47 . 74 – 54
= 2679 -74 + 3478-54
= 2605 + 3478 – 54
= 6083-54
= 6029
b) 15 .( – 27 + 30 – 27 . ( 30 – 15 ) – 30 . ( 5 -27 )
= 15 . (-27 ) + 30 – 27 . 30 -15 – 30 .5 -27
=(15-15) + ( 27-27) + ( 30 – 30 ) – 27 .5
=0 + 0 + 0 .135
= 0 – 135
= -135