Số lớn nhất trong các số 459 495; 459 549; 549 954 và 549 945 là 549 954.

Chọn C.

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lớp 3 mà có  số mũ à

1 000 000 x 2 x 4 x 8 x 16 x 32 x 64 x 128 x 256 x 512 x 1024 x 2048 x 4096 x 8192=10000000248163264

1.

a.1

b.8

c.3

d.2

e.7

2.

B.54,09

a ) 768 - 549 + 548

= 219 + 548

= 767

b ) ( 647 + 835 ) - ( 645 + 833 )

= 1482 - 1478

= 4

Answer : a ) 767

b ) 4

a) 786 -549 + 548

  =786+(548-549)

   =786-1=785

b) (647+835)-(645+833)

 =647+835-645-833

= (647-645)+(835-833)

=2+2=4

k cho mk nha

A = 5 + 5² + 5³ + ... + 5⁴⁹ + 5⁵⁰

⇒ 5A = 5² + 5³ + 5⁴ + ... + 5⁵⁰ + 5⁵¹

⇒ 4A = 5A - A

= (5² + 5³ + 5⁴ + ... + 5⁵⁰ + 5⁵¹) - (5 + 5² + 5³ + ... + 5⁴⁹ + 5⁵⁰)

= 5⁵¹ - 5

⇒ A = (5⁵¹ - 5) : 4

549 + X = 1326                                 

X = 1326 – 549                                    

X = 777                                                

Đáp án là A

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Đáp án là A