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a: =1/4+1/4=2/4=1/2
b: =3/5+3/5=6/5
c: =5/9+7/9=12/9=4/3
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a) 21: 25 =\(\dfrac{21}{25}\)
30: 43 = \(\dfrac{30}{43}\)
61: 69 = \(\dfrac{61}{69}\)
17: 100 = \(\dfrac{17}{100}\)
b)9 : 4 = \(\dfrac{9}{4}\)
51: 7 = \(\dfrac{51}{7}\)
60 : 39 = \(\dfrac{60}{39}\)
200 : 163 = \(\dfrac{200}{163}\)
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a ) y : 102 = 203 ( dư 101 )
y=203x102+101
y=20 706+101
y=20 807
b ) 25 x y x 4 = 500
25xy=500:4
25xy=125
y=125:25
y=5
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500x6+500x4-108:12:9
=500x(6+4)-9:9
=500x10-1
=5000-1
=4999
9782x35-9782x25+1000:5:2
=9782x(35-25)+200:2
=9782x10+100
=97820+100
=97920
37800:25:4+57+467x43
=1512:4+57+20081
=378+57+20081
=435+20081
=20516
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500 × 4 × 2 × 25 - 500 × 3 × 2 × 30
= 500 × (4 × 2 × 25) - 500 × (3 × 2 × 30)
= 500 × 200 - 500 × 180
= 500 × (200 - 180)
= 500 × 20
= 10000
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a, 240: 8= 30
Điền: 30
b, 540:9= 60
Điền: 60
c, 20 x 6 = 120
Điền: 120
d, 45:9=5
Điền: 5
500:25= ?
a.100
b.10
c.20
d.4
= 20 nha k đi