![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 10000 - 47 . 72 - 47 . 28
= 10000 - 47 ( 72 - 28 )
= 10000 - 47 . 44
= 10000 - 2068
= 7932
b) 3457 - 27 . 48 - 48 . 73 + 6543
= 3457 - 48 ( - 27 - 48 ) + 6543
= 3457 - 48 . ( - 75 ) + 6543
= 3457 - ( - 27 ) + 6543
= 3457 + 27 + 6543
= 10027
a, 10000-47×72-47×28
= 10000-47(72+28)
=10000-47×100
=10000-4700= 5300
![](https://rs.olm.vn/images/avt/0.png?1311)
a/ = 113 x ( 54 + 45 + 1 ) = 113 x 100 = 11300
b/ = 47 x ( 54 - 53 ) - 20 - 27 = 47 - 20 - 27 = 0
c/ = 145 x ( 99 + 1 ) - 143 x ( 101 - 1 ) = 145 x 100 - 143 x 100 = 100 x ( 145 - 143 ) = 100 x 2 = 200
d/ = 1002 x 9 - 2 x 9 = 9 x ( 1002 - 2 ) = 9 x 1000 = 9000
e/ = 24 x 427 + 24 x 573 = 24 x ( 427 + 573 ) = 24 x 1000 = 24000
f/ Sửa đề bài là :
2008 x 867 + 2008 x 133 = 2008 x ( 867 + 133 ) = 2008 x 1000 = 2008000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)
\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)
\(=\left(145\times100\right)-\left(143\times101\right)\)
\(=14500-14443\)
\(=57\)
b) \(54\times47-47\times53-20-27\)
\(=47\times\left(54-53\right)-20-27\)
\(=47-20-27\)
\(=0\)
c) \(10000-47\times72-47\times28\)
\(=10000-47\times\left(72+28\right)\)
\(=10000-47\times100\)
\(=10000-4700\)
\(=5300\)
d) \(3457-27\times48-48\times73+6543\)
\(=\left(3457+6543\right)-48\times\left(27+73\right)\)
\(=10000-48\times100\)
\(=10000-4800\)
\(=5200\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhanh:
49 x 47 - 47 x 47 -30 -17
= 47 x ( 49 - 47 ) - 30 - 17
= 47 x 2 - 30 - 17
= 94 - 30 - 17
= 64 - 17
= 47
nhớ k cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\dfrac{47\times48-47\times47-24-23+2046}{2+4+8+..+512+1024}\)
Đặt tử số là B, mẫu số là C thì
B = 47\(\times\)48 - 47 \(\times\) 47 - 24 -23+2046vàC = 2 + 4 + 8 +....+ 512 + 1024
B = 47 \(\times\) 48 - 47 \(\times\) 47 - 24 - 23 + 2046
B= 47 \(\times\) 48 - 47 \(\times\) 47 - ( 24 + 23) + 2046
B = 47 \(\times\) 48 - 47 \(\times\) 47 - 47 + 2046
B = 47 \(\times\) 48 - 47 \(\times\) 47 - 47 \(\times\) 1 + 2046
B = 47 \(\times\) ( 48 - 47 - 1) + 2046
B = 47 \(\times\) 0 + 2046
B = 2046
C = 2 + 4 + 8+ ....+ 512 +1024
C \(\times\) 2 = 4 + 8 +.....+ 512 + 1024 + 2048
C \(\times\) 2 - C = 2048 - 2
C \(\times\) ( 2 - 1) = 2046
C = 2046
A = \(\dfrac{B}{C}\) = \(\dfrac{2046}{2046}\) = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
a)2006x125+1000=250,75x125x8+1000=250,75x1000+1000=1000(250,75+1)=1000x251,75=251750
731-47+69-253=(731+69)-(47+253)=800-300=500
b)3,54x73+0,46x25+3,54x26+0,46x75+3,54
=3,54(73+26+1)+0,46(25+75)
=3,54x100+0,46x100
=354+46=400
![](https://rs.olm.vn/images/avt/0.png?1311)
53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 )
= 39 x 100 - 21 x 100
= 100 x ( 39 - 21 )
= 100 x 18
= 1800
53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 )
= 39 x 100 - 21 x 100
= 100 x ( 39 - 21 )
= 100 x 18
= 1800
ai k mik k lai
![](https://rs.olm.vn/images/avt/0.png?1311)
53 .39 + 47 . 39 - 53 . 21 - 47 .21
= (53 + 47) . 39 - (53 + 47) . 21
= 100 . 39 - 100 . 21
= 100 . (39 - 21)
= 100 . 18
= 1800
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có : 47*11-4700*0,1-47
=47*11-47*100*0,1-47
=47*11-47*(100*0,1)-47
=47*11-47*10-47*1
=47*(11-10-1)
=47*0=0
Vậy (7,5*18,3+26,4*18,3)*0=0
Tính:
(7,5×18,3+26,4×18,3)×(47×11-4700×0,1-47)
= 18,3 ( 7,5 + 26,4) . 47 ( 11 - 10 - 1)
= 18,3 . 33,9 . 47 . 0
= 0
=10000-47.100
=10000-4700
=5300
10000-47x(74+26)
=10000-47x100
=10000-4700
=5300