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Tính nhanh:
a, 35x18 -5.7x28 = 35x18 -35x28 = 35 x (18 – 28) = 35 x ( -10) = -350
b,24x(16-5)-16x(24-5) = 24x16 – 24 x 5- 16x24 + 16x5 = (– 24 + 16)x 5 = -8 x 5 = -40
d,31x(-18)+31x(-81)-31 = 31x (-18 -81 – 1) = 31 x (-100) = -3100
e,(-12)x47+(-12)x52+(-12) = (-12)x (47+52 + 1)= (-12)x 100= - 1200
Ý c chưa rõ đề bài...
\(a.35\times18-5.7\times28\)
\(=35.18-35.28\)
\(=35.\left(18-28\right)\)
\(=35.\left(-10\right)\)
\(=-350\)
\(b.24.\left(16-5\right)-16.\left(24-5\right)\)
\(=24.16-24.5-16.24-16.5\)
\(=\left(24.16-16.24\right)-24.5-16.5\)
\(=0-\left(24+16\right).5\)
\(=0-40.5\)
\(=0-200\)
\(=-200\)
![](https://rs.olm.vn/images/avt/0.png?1311)
24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= -24 . 5 - 16 . 5
= -40 . 5
= -200
24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= 24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
= 24 . 11 - 16 . 21
= ( 24 - 16 ) . ( 11 - 21 )
= 8 . - 10
= - 80
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24.(16-5)-16.(24-5)
= 24 . 16 - 24 . 5 - 16 . 24 + 5. 16
= 5 . 16 - 24 . 5
= 5. ( 16 - 24 )
= 5 . ( - 8)
= - 40
Lê Thị Thanh Xuân k giups đc thì đừng lm v nhé
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\(a.24.64+36.24-100.24\)
\(=24.\left(64+36-100\right)\)
\(=24.0\)
\(=0\)
\(b.5.4^2-16:2^2\)
\(=5.16-16:4\)
\(=80-4\)
\(=76\)
Hok tốt
a, 24.64+36.24-100.24
=24.(64+36-1000
=24.0
=0
b, 5.4^2-16:2^2
=80-4
=76
![](https://rs.olm.vn/images/avt/0.png?1311)
24.(16-5)-16.(24-6)
=24.16-24.5-16.24-6.16
=24.(16-5-16)-6.16
=24.(-5)-6.16
=-120-96
=-216
TÍNH NHANH
1) 24.( 16-5) -16.(24-5)
2)31.(-18)+31.(-18)-31
3) 13.(23+22) - 3.(17+28)
4) 19.25+9.95+19.30
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1 :
a) 25 - (-75) + 32 - (32 + 75)
= 25 + 75 + 32 - 32 - 75
= 25 + (75 - 75) + (32 - 32)
= 25 + 0 + 0
= 25
b) |-127| - 18 . (5 - 6)
= 127 - 18 . (-1)
= 127 + 18
= 145
c) 24.(16 - 5) - 16.(24 - 5)
= 24.11 - 16.19
= 16.16,5 - 16.19
= 16.(16,5 - 19)
= 16.(-2,5)
= -40
ủng hộ tớ nha
kb nha
a)25-(-75)+32-(32+75)=25-(-75)+32-107=25
b)l-127l-18.(5-6)=127-18.(-1)=127-(-18)=145
c)24.(16-5)-16.(24-15)=24.11-16.9=264-144=120
![](https://rs.olm.vn/images/avt/0.png?1311)
24 . (16 - 5) - 16 . (24 - 5)
= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= 24 . (16 - 5 - 16) - 16 . 5
= 24 . (-5) - 16 . 5
= (-24) . 5 - 16 . 5
= 5 . (-24 - 16)
= 5 . (-40)
= -200
kết quả sai rùi bạn ơi phải băng -40 cơ mà
sao lại bằng -200 được nhỉ
24 . (16 - 5) - 16 . (24 - 5)
= 24.16 - 24. 5 - 16.24 - 16.5
=( 24.16-24.16)-( 24.5-16.5)
= 0 - [5.(24-16) ]
= 0 - 5.8
= 0 - 40
= -40
tk mình nha!
24 x ( 16 - 5 ) - 16 x ( 24 - 5 )
= 24 x 16 - 24 x 5 - 16 x 24 + 16 x 5
= ( 24 x 16 - 16 x 24 ) + 5 x ( 16 - 24 )
= 0 + 5 x ( -8 )
= - 40