Question

Answer 1

bài 3 :

1, đặt a = 3 ; b = 3 ta có :

1120 - [ 125 + 3 ( 17 - 2 )² ] + 25

= 1120 - [ 125 + 3 . 15² ] + 25

= 1120 - [ 125 + 3 . 225 ] + 25

= 1120 - [ 125 + 675 ] + 25

= 1120 - 800 + 25 

= 320 + 25

= 345

2, B = ( 45 x 10 x 15625 + 9765625 . 256 ) :  ( 2⁸ . 2⁵ + 5⁴ . 5⁷ )

B = ( 7031250 + 2500000000 ) : ( 2⁸⁺⁵ + 5⁴⁺⁷ )

B = 2507031250 : 2¹³ + 5¹¹

B = 2507031250 : 8192 + 48828125

B = 2507031250 : 48836317

B = 51,33538725

3, đặt a - 3, b = 5, c = 7, d = 1 ta có : 

5.35² - \(\dfrac{3^3}{1}\)+ 7

= 5.1225 - 27 + 7

= 6125 - 27 + 7 

= 6105