a, 53.25 - 25.12 + 75.53

= 53.25 - 25.12 + 25.3.53

= 53. 25 - 25.12 + 25. 159

= 25. (53 - 12 + 159)

= 25.200

= 5000

b) 260:[5+7.(72:23−6)]−32260:[5+7.(72:23
−6)]−32

$=\; 260:\; [5+\; 7.(72:8-6)]-\; 9$

$=\; 260:\; [5+7.(9-6)]-9$

$=\; 260:\; [5+7.3]-9$

$=\; 260:\; [5+21]-9$

$=\; 260:\; 26-9$

= 10-9

=1

g

a, 53.25 - 25.12 + 75.53

= 53.25 - 25.12 + 25.3.53

= 53. 25 - 25.12 + 25. 159

= 25. (53 - 12 + 159)

= 25.200

= 5000

b) 260:[5+7.(72:23−6)]−32260:[5+7.(72:2³
−6)]−3²

$=\; 260:\; [5+\; 7.(72:8-6)]-\; 9$

$=\; 260:\; [5+7.(9-6)]-9$

$=\; 260:\; [5+7.3]-9$

$=\; 260:\; [5+21]-9$

$=\; 260:\; 26-9$

= 10-9

=1

1 cm trên bản đồ bằng 10000 cm trên thực tế