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) \(257+149-57-49\)

\(=\left(257-57\right)+\left(149-49\right)\)

\(=200+100\)

\(=300\)

b) \(918-142-258\)

\(=918-\left(142+258\right)\)

\(=918-400\)

\(=518\)

c) \(26.7-17.9+13.26-17.11\)

\(=26.\left(7+13\right)-17.\left(9+11\right)\)

\(=26.20-17.20\)

\(=20.\left(26-17\right)\)

\(=20.9\)

\(=180\)

d) \(1754:17-74:17+20:17\)

\(=\left(1754-74+20\right):17\)

\(=1700:17\)

\(=100\)