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`a, 1000 : 100 = 10`
`b, 75 xx 100 = 7500`
`c, 900 xx 10 = 9000`
`d, 8 xx 100 : 10 : 10 xx 10000 = 80000`
a ) 18 x 10 = 180
18 x 100 = 1800
18 x 1000 = 18000
82 x 100 = 8200
75 x 1000 = 75000
19 x 10 = 190
256 x 1000 = 256000
302 x 10 = 3020
400 x 100 = 40000
b ) 9000 : 10 = 900
9000 : 100 = 90
9000 : 1000 = 9
6800 : 100 = 68
420 : 10 = 42
2000 : 1000 = 2
20020 : 10 = 2002
200200 : 100 = 2002
2002000 : 1000 = 2002
a)18 x 10 = 180
18 x 100 = 1 800
18 x 1000 = 18 000
82 x 100 = 8 200
75 x 1000 = 75 000
19 x 10 = 190
256 x 1000 = 256 000
302 x 10 = 3 020
400 x 100 = 40 000
b)9000 : 10 = 900
9000 : 100 = 90
9000 : 1000 = 9
6800 : 100 = 68
420 : 10 = 42
2000 : 1000 = 2
20 020 : 10 = 2 002
200 200 : 100 = 2 002
2 002 000 : 1000 = 2 002
A = ( 15 : x + 15 * x ) + 2009 * y
= 30 * x + 2009 * y
Thay x = 1 và y = 0 vào A ta có :
A = 30 x 1 + 2009 x 0
= 30 + 2009
= 2039
B = y : ( 119 * x + 4512 ) + ( 756 : x - y )
Thay x = 1 và y = 0 vào B ta có :
B = 0 : ( 119 x 1 + 4512 ) + ( 756 : 1 - 0 )
= 0 + 756
= 756
C = ( 10 + y ) : ( 10 - y ) - x + 10 * x - 10 : x + y
Thay x = 1 và y = 0 vào C ta có :
C = ( 10 + 0 ) : ( 10 - 0 ) - 1 + 10 x 1 - 10 : 1 + 0
= 10 : 10 - 1 + 10 - 10
= 1 - 1 + 10 - 10
= 0
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Bài 1:
a: x+1/2=5/6
nên x=5/6-1/2=1/3
b: x+1/4=3/4
nên x=3/4-1/4=2/4=1/2
c: x+3/10=1/2
nên x=1/2-3/10=5/10-3/10=1/5
d: x+1/4=3/8
nên x=3/8-1/4=3/8-2/8=1/8
3000 : 10 x 500 = 300 x 500 = 150000
2000 : 100 x 600 = 20 x 600 = 12000
a, 130000
b, 231210
c, 660000
d, 140000
a, 130000
b, 231210
c, 660000
d, 140000