a) 17*85+17*15-120
b)2.31.12+4.6.42+8.27.3
c)24;{300:[375-(150+5*15)]}
c ) 37 ( 24 - 77 ) - 24 ( 37 -77 ) =
d ) (-48) (12-85) - 12 (85 - 48)=
e ) 17. 15 - 34 . 42 + 19 . 17 =
SOS =( em can loi giai chi tiet a !
c; 37.(24 - 77) - 24.(37 - 77)
= 37.24 - 37.77 - 24.37 + 24.77
= (37.24 - 24.37) - (37.77 - 24.77)
= 0 - 77.(37 - 24)
= - 77 . 13
= - 1001
e) 17.15 - 34.42 + 19.17
= 17.(15 + 19) - 34.42
= 17.34 - 34.42
= 34.(17 - 42)
= 34. (-25)
= (-850)
d, (-48).(12 - 85) - 12.(85 - 48)
= -48.12 + 48.85 - 12.85 + 12.48
= (-48.12 + 12.48) + (48.85 - 12.85)
= 0 + 85.(48 - 12)
= 85.36
= 3060
2.31.12+4.6.42+8.27.3
2.31.12+4.6.42+8.27.3
= (2.12).31+(4.6).42+(8.3).27
= 24.31+24.42+24.27
= 24.(31+42+27)
= 24.100
= 2400
_HT_
2.31.12+4.6.42+8.27.3
2.31.12+4.6.42+8.27.3
=24.31+24.42+27.24
=24.(31+42+27)
=24.100
=2400
2.31.12+4.6.42+8.27.3 = ?
2.31.12+4.6.42+8.27.3 = 24x31+24x42+24x27=24x(31+42+27)=24x100=2400 nha Dương Ngọc Phuong Linh
Tính nhanh: 2.31.12 + 4.6.42 + 8.27.3
2.31.12 + 4.6.42 + 8.27.3
= ( 2.12). 31 + ( 4. 6).42 + (8.3). 27
= 24.31 + 24.42 + 24.27
= 24.(31 + 42 + 27) = 24.100 = 2400
2.31.12+4.6.42+8.27.3
2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
= 744 + 24 + 648
= 1416
NẾU ĐÚNG THÌ K CHO MK NHA !!!
MK KO CHẮC ĐÚNG VÌ MK MỚI LỚP 5
a)2.31.12+4.6.42+8.27.3
b)36.28+36.82+64.69+64.41
a) kết quả là:2400
b)Kết quả là: 11000
Đáp số: 11000
a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 24 x 31 + 24 x 42 + 24 x 27
= 744 + 1008 + 648
= 2400
b) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41
= 36 x (28 + 82) + 64 x (69 + 41)
= 36 x 110 + 64 x 110
= (36 + 64) x 110
= 100 x 110
= 11000
2.31.12+4.6.42+8.27.3 tính nhanh
2.12=24
4.6 =24
8.3 = 24
=24(31+42+27) = 24.100 = 2400
2.31.12+4.6.42+8.27.3
=(2.12).31+(4.6).42+(8.3).27
=24.31+24.42+24.27
=24.(31+42+27)
=24. 100
=2 400
2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 .3
= (2 . 12) . 31 + (4 . 6) . 42 + (8 . 3) . 27
= 24 . 31 + 24 . 42 + 24 . 27
= 24 . (31 + 42 + 27)
= 24 . 100
= 2400
tính nhanh: 2.31.12+4.6.42+8.27.41