65391÷56=bao nhiêu
K
Khách
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H
19 tháng 11 2021
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 8 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 8 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
19 tháng 11 2021
nửa chu vi HCN là: 56 : 2 =28m
chiều dài HCN là: (28 + 8) : 2=18m
chiều rộng HCN là: 18 - 8 = 10m
diện tích HCN là: 18 x10 = 180 m2
thu đc số kg rau là: 180 x 5 = 900 kg
HN
2
19 tháng 11 2021
TL :
Ví dụ :
ab = 12 và ba = 21 thì
12 + 21 = 33
33 chia hết cho 11
HT
19 tháng 11 2021
Ta có: ab = a * 10 + b
ba = b * 10 + a
=> ab + ba = a * 10 + b + b * 10 + a = a * (10 + 1) + b * (10 + 1) = 11 * (a + b)
=> ab + ba chia hết cho 11
19 tháng 11 2021
A= 2008 x 2008
= 2008 x ( 2007+1)
= 2008 x 2007 + 2008
B= 2007 x 2009
= 2007 x ( 2008+1)
= 2007 x 2008 + 2007
Vì 2008>2007 => 2008 x 2007 + 2008 > 2007 x 2008 + 2007
Hay A > B
Vậy A > B
_HT_
19 tháng 11 2021
Gọi số học sinh được nhận thưởng là x; số vở là y
=> y - x * 2 = 11
x * 5 - y = 7
=> y - x * 2 + x * 5 - y = 11 + 7 = 18
=> (y - y) + x * (5 - 2) = 18
=> x * 3 = 18 (học sinh)
=> x = 18 / 3 = 6
=> y = 11 + 6 * 2 = 11 + 12 = 23 (vở)
cái đó tính bằng 11 664,125