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1 : Tính nhanh:
a) 2376 + 3425 - 376 - 425 = ( 2376 - 376 ) + ( 3425 - 425 )
= 2000 + 3000
= 5000
b)4638 - 2437 + 5362 - 7563 = 2210 + ( - 2210 )
= 0
c) 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
= 45 x 4 + 15 x 4
= ( 45 + 15 ) x 4
= 60 x 4
= 240
d) 4 x 125 x 25 x 8 = ( 4 x 25 ) x ( 125 x 8 )
= 100 x 1000
= 100000
e) 2 x 8 x 50 x 25 x 125 = ( 2 x 50 ) x ( 8 x 125 ) x 25
= 100 x 1000 x 25
= 100000 x 25
= 2500000
2 : Tính nhanh bằng 2 cách:
C1 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= ( 125 - 25 ) + ( 125 - 25) + ( 125 - 25 ) + ( 125 - 25 )
=100 + 100 + 100 + 100
= 100 x 4
= 400
C2 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= 125 x 4 - 25 x 4
= ( 125 - 25 ) x 4
= 100 x 4
= 400
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125*20*8*25*5
= ( 125*8 ) * ( 20*5 ) * 25
= 1000 * 100 * 25
= 100000 * 25
= 2500000
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=[(25*4)*(125*8)+(380+620)]:[(4*25:100)*(8*125)
=(100*1000+1000):(1*1000)
=101000:1000
=101
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= ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125) x 3
= 100 x 100 x 1000 x 3
= 30000000
Tk mk nha
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2.3.4.8.50.125
=(2.50).(8.125).3.4
=100.1000.12
=100000.12=1200000
2 x 3 x 8 x 50 x 125
= ( 6 x 8 ) x 50
= 48 x 50 x 125
= 2400 * 125
= 300000 .
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125 x 26 x 8 + 24 x 25 x 40 - 2000
= ( 125 x 8 ) x 26 + 24 x ( 25 x 40 ) - 2000
= 1000 x 26 + 24 x 1000 - 2000
= 1000 x ( 26 + 24 ) - 2000
= 1000 x 50 - 2000
= 50000 - 2000
= 48000
Học tốt nhé bạn ~
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40025 - 25000 : 125 : 8
= 40025 - 200 : 8
= 40025 - 25
= 40000
chúc giáng sinh vui vẻ
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2*5*25*8*8*125=(2*5)*(25*4)*(125*8)=10*100*1000=1000000
![](https://rs.olm.vn/images/avt/0.png?1311)
25 + 25 + 25 + 25 + 25 + 25 +25 + 25=25x8=200
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15=(45x4)+(15x4)=180+60=240
3264000:8:125
=3264000:(8x125)
=3264000:1000
=3264
3264000:8:125
= 3264000:(8 x 125)
= 3264000 : 1000
= 3264