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1996 +3992 +5988 +7984 = 19960
2 X 3 X 4 X 8 X 50 X125= 1200000
1996+3992+5998+7984
=(1996+7984)+(3992+5998)
=9980+9990
=19970
2*3*4*8*50*25*125
=(2*50)*(4*25)*(8*125)*3
=100*100*1000*3
=30000000
2 x 8 x 50 x 25 x 125
= ( 125 x 8 ) x ( 50 x 2 ) x 25
= 1000 x 100 x 25
=2500000
4 x 125 x 25 x 8
= ( 125 x 8 ) x ( 25 x 4 )
= 1000 x 100
=100000
2 x 3 x 4 x 5 x 50 x 25
= ( 25 x 4 ) x ( 2 x 50 ) x ( 3 x 5 )
= 100 x 100 x 15
= 150000
25 x 20 x 125 x 8 - 8 x 20 x 5 x 125
= ( 25 x 20 ) x ( 125 x 8 ) - ( 20 x 5 ) x ( 125 x 8 )
= 500 x 1000 - 100 x 1000
= 500000 - 100000
= 400000
a) 5 x 3 x 4 = (5 x 4) x 3
= 20 x 3
= 60
b) 6 x 5 x 7 = (6 x 5) x 7
= 30 x 7
= 210
c) 20 x 9 x 5 = (20 x 5) x 9
= 100 x 9
= 900
d) 2 x 7 x 50 = (2 x 50) x 7
= 100 x 7
= 700
TL :
1) 112 x 5 x 2
= 112 x 10
=1120
2) 2 x 247 x 5
= 247 x 10
= 2470
3) 2 x 4 x 3 x 5
= 12 x 10
= 120
4) 20 x 7 x 5 x 8
= 100 x 56
= 5600
5) 25 x 35 x 4
= 100 x 35
= 3500
6) 47 x 7 + 47 x 3
= 47 x ( 7 + 3 )
= 47 x 10
= 470
7) 5 x 7 x 9 x 2
= 10 x 63
= 630
8) 125 x 9 x 7 x 8
= 1000 x 63
= 63000
9) 4 x 97 x 25
= 100 x 97
= 9700
10) 8 x 9 x 10 ( chắc thế )
= 80 x 9
= 720
11) 240 x 24 + 240 x 24
= 24 x ( 240 + 240 )
= 24 x 480
= 11520
12) 27 x 2 + 27 x 3 + 27 x 5
= 27 x ( 2 + 3 + 5 )
= 27 x 10
= 270
13) 48 x 4 + 48 x 3 + 48 x 2 + 48
= 48 x 4 + 48 x 3 + 48 x 2 + 48 x 1
= 48 x ( 4 + 3 + 2 + 1 )
= 48 x 10
= 480
14) 247 x 36 + 247 x 64
= 247 x ( 36 + 64 )
= 247 x 100
= 24700
15) 76 x 6 + 76 x 4
= 76 x ( 6 + 4 )
= 76 x 10
= 760
16) 249 x 101 - 249
= 249 x 101 - 249 x 1
= 249 x ( 101 - 1 )
= 249 x 100
= 24900
Mong các ban cho tui 10 cái T I C K
~HT~
a, 1996 + 3992 + 5998 + 7984
= ( 1996 + 7984 ) + ( 3992 + 5998)
= 9980 + 9990
= 19970
b, 2 x 3 x 4 x 8 x 50 x 25 x 125
= ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 ) x 3
= 100 x 100 x 1000 x 3
= 10000 x 1000 x 3
= 10 000 000 x 3
= 30 000 000
a) 1996 + 3992 + 5998 + 7984
= ( 1996 + 7984 ) + ( 3992 + 5998)
= 9980 + 9990
= 19970
b)
2 x 3 x 4 x 8 x 50 x 25 x 125
= ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 ) x 3
= 100 x 100 x 1000 x 3
= 10000 x 1000 x 3
= 10 000 000 x 3
= 30 000 000