Question

a, 257+149-57-49

b, 918-142-258

c,26,7-17,9+13.26-17.11

d,1754:17-74:17+20:17

Answer 1

a: =200+100=300

b: =918-400=518

d: =(1754-74+20):17=100

Answer 2

a) ( 257 - 57 ) + ( 149 - 49 ) = 200 + 100 = 300

b) 918 - ( 142 + 258 ) = 918 - 400 = 518

d) ( 1754 - 74 + 20 ) : 17 = 1700 : 17 = 100

Answer 3

Answer 4

Dấu . Là nhân hay phẩy vậy do ko chắc nên ko làm

Answer 5

a) ( 257 - 57 ) + ( 149 - 49 ) = 200 + 100 = 300

b) 918 - ( 142 + 258 ) = 918 - 400 = 518

c) 26. ( 7 + 13 ) - 17. ( 9 + 11 ) = 26. 20 - 17. 20 = 20. ( 26 -17 ) 

= 20. 9 = 180

d) ( 1754 - 74 + 20 ) : 17 = 1700 : 17 = 100