1/đổi đơn vị đo:
275 m=......km
1098 m2=.......dam2
7,58km=......m
203,8 m 2=.......dam2
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67 dam2 51m2 = 67 dam2 + m2 = dam2
82 dam2 7m2 = 82dam2 + m2 = dam2
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U
k m 2 |
h
m
2
|
d a m 2 | m 2 | d m 2 | c m 2 | m m 2 |
1 k m 2 =100 h m 2 | 1 h m 2 = 100 d a m 2 = 0,01 k m 2 | 1 d a m 2 = 100 m 2 = 0,01 h m 2 | 1 m 2 =100 m 2 =0,01 d a m 2 | 1
d
m
2
= 100
c
m
2
= 0,01
m
2
|
1 c m 2 = 1000 m m 2 = 0,01 d m 2 | 1 m m 2 = 0,01 c m 2 |
Chú ý : Khi đo diện tích ruộng đất người ta còn dùng đơn vị héc-ta (ha)
1ha = 10000 m 2
a) 1,2075 km2=1207500 m2 b) 0,452 hm2 = 4520 m2
c) 12,075 ha = 120750 m2 d) 10,241 dam2=1024,1 m2
a) 1,2075 km2 = 1207500 m2 b) 0,452 hm2 = 4520 m2
c) 12,075 ha = 120750 m2 d) 10,241 dam2 = 1024,1 m2
km2 | hm2 | dam2 | m2 | dm2 | cm2 | mm2 |
=100hm2 | =100dam2 =\(\frac{1}{100}\)km2 | 100 m2 =\(\frac{1}{100}\)hm2 | ||||
tương tự đi mà làm |
a 100
b \(\frac{1}{100}\)
c 100
Gọi số bị chia là a
Số chia là b
Thương là q
Số dư là r
Ta có :
a+73=q.(b+4)+(r+5)
a+73 = q.b+q.4+ ( r + 5 )
a + 73 = a+4.q+5
Suy ra : 4.q =73-5
4.q=73-5
4.q=68
q=68:4
q=17
Vây thương là 17 . k cho mình nha
275 m = 0,275 km
1098 m2 = 10,98 dam2
7,58km = 7580 m
203,8 m2 = 2,038 dam2
chúc bạn học tốt!