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18ab : ab = 25
suy ra 18ab = 25ab
suy ra ab = 0
suy ra a = 0 hoac b = 0
neu a = 0 thi b la mot so bat ki
neu b = 0 thi a la mot so bat ki
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25 + 25 + 25 + 25 + 25 + 25 + 25 + 25 + 25 + 25
= 25 x 10
= 250
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a, 75 x 75 + 75 x 24 + 75
= 75 x ( 75 + 24 + 1 )
= 75 x 100
= 7500
b, 25 × 25 + 25 × 25 + 25 × 25 + 25 × 24 + 25
= 25 x ( 25 + 25 + 25 + 24 + 1 )
= 25 x 100
= 2500
c, 125 x 4 x 25 x 8
= ( 125 x 8 ) x ( 4 x 25 )
= 1000 x 100
= 100000
a) = 75 x (75+24+1)
=75 x 100
=7500
b) =25 x (25+25+25+24+25)
= 25 x 124
= 3100
c) = (125 x 8) x (25 x 4)
=1000 x 100
=100000
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25 + 25 + 25 + 25 + 25 + 25 +25 + 25=25x8=200
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15=(45x4)+(15x4)=180+60=240
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326:25=13,04
-1000:25=-40
119:12=9 dư 11
852:25=34,08
286:14=20 dư 6
105:25=4 dư 5
180:60=3
195:25=7 dư 20
786:30=26 dư 6
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25*7+25*3+25*4+25*6
= 25*(7+3+4+6)
= 25*20
= 25*10*2
= 250*2
= 500
18ab : ab = 25
=> 1800 + ab = 25 x ab
=> 1800 = 24 x ab
=> ab = 1800 : 24
=> ab = 75
Vậy ab = 75
1875:75=25 nhe