x:5+6408:4=8972:4
K
Khách
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CM
5 tháng 9 2019
a) 999 < 1000
3000 > 2999
8972 = 8972
500 + 5 < 5005
b) 9999 > 9998
9998 = 9990 + 8
2009 < 2010
7351 > 7153
CD
1
25 tháng 12 2015
8972-X x35=8377.
X.35=8972-8377
X.35=595
X=595:35=17
TICK MH NHA *chu đức duy*
24 tháng 7 2019
\(A=5\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{6480}\right)\)
\(=5\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{80.81}\right)\)
\(=5\left(\frac{2-1}{1.2}+\frac{3-2}{2.3}+\frac{4-3}{3.4}+...+\frac{81-80}{80.81}\right)\)
\(=5\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{80}-\frac{1}{81}\right)\)
\(=5\left(1-\frac{1}{81}\right)=\frac{5.80}{81}=\frac{400}{81}\)
b)
\(B=7\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+...+\frac{1}{483}\right)\)
\(=7.\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+...+\frac{1}{21.23}\right)\)
=> \(2.B=7\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+...+\frac{2}{21.23}\right)\)
\(=7\left(\frac{5-3}{3.5}+\frac{7-5}{5.7}+\frac{9-7}{7.9}+...+\frac{23-21}{21.23}\right)\)
\(=7.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{21}-\frac{1}{23}\right)\)
\(=7\left(\frac{1}{3}-\frac{1}{23}\right)=\frac{7.20}{69}=\frac{140}{69}\)
=> \(B=\frac{140}{69}:2=\frac{70}{69}\)
15 tháng 6 2018
Câu trả lời :
6408 giây = \(\frac{89}{50}giờ\)
Chúc bạn học giỏi và có một kì nghỉ hè vui ! ^^
DA
11 tháng 12 2017
45 lần thừa số thứ 2 là
(6408 - 2403) : 45 = 89
số thứ 1 là
2403 : 89 = 27
vậy số thứ 1 là 27
số thứ 2 là 89
G
24 tháng 12 2019
Merry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry ChristmasMerry Christmas
4 tháng 12 2016
gọi 2 số cần tìm là a, b
ta có a x b = 2403 ( 1)
và (a+ 45) x b = 6408
=> a x b+ b x 45 = 6408
(1) => 2403 + b x 45 = 6408
=> b x 45 = 6408- 2403
=> b x 45 = 4005
=> b= 89
(1) => a= 2403 : 89
=> a= 27
CM
13 tháng 4 2019
Học sinh nhẩm và ghi kết quả như sau:
3 x 4 = 12 2 x 6 = 12 4 x 3 = 12 5 x 6 = 30
3 x 7 = 21 2 x 8 = 16 4 x 7 = 28 5 x 4 = 20
3 x 5 = 15 2 x 4 = 8 4 x 9 = 36 5 x 7 = 35
3 x 8 = 24 2 x 9 = 18 4 x 4 = 16 5 x 9 = 45
6 tháng 9 2021
3 x4 = 12
3 x7 = 21
3 x5 = 15
3 x8 =24
2 x 6= 12
2 x8 = 16
2 x4 =8
2 x9 =18
4 x3 =12
4 x7 =28
4 x9 =36
4 x4 =16
5 x6 =30
5 x4 =20
5 x7 =35
5 x9 =45
N
13 tháng 7 2017
a) 4 x 2 + 4 x 3 + 4 x 4 + 4
= 4 x ( 2 + 3 + 4 + 1 )
= 4 x 10
= 40
b) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5
= 5 x ( 23 - 2 - 3 - 4 - 5 + 5 )
= 5 x 14
= 70
13 tháng 7 2017
a)4x(1+2+3+4)
=4x10
=40
b)5x23—5x2—5x3—5x4—5x5+5
=5x(23—2—3—4—5+1)
=5x10
=50
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