Răspuns :
a) 80 - 55 = 25 25 + 34 = 59
b) 75 + 49 = 124 124 - 26 = 98
c) 135 + 165 = 300 800 + 900 = 1700
300 + 1700 = 2000
d) 300 + 124 = 424 424 - 67 = 357
e) 400 + 399 + 401 = 1200
f) 1 + 5 = 6 1 + 2 + 3 + 4 + 5 = 15
15 - 6 = 9
g) 9999 - 1000 = 8999
b) 75 + 49 = 124 124 - 26 = 98
c) 135 + 165 = 300 800 + 900 = 1700
300 + 1700 = 2000
d) 300 + 124 = 424 424 - 67 = 357
e) 400 + 399 + 401 = 1200
f) 1 + 5 = 6 1 + 2 + 3 + 4 + 5 = 15
15 - 6 = 9
g) 9999 - 1000 = 8999
a) 80 - 55 = 25 25 + 34 = 59
b) 75 + 49 = 124 124 - 26 = 98
c) 135 + 165 = 300 800 + 900 = 1700
300 + 1700 = 2000
d) 300 + 124 = 424 424 - 67 = 357
e) 400 + 399 + 401 = 1200
b) 75 + 49 = 124 124 - 26 = 98
c) 135 + 165 = 300 800 + 900 = 1700
300 + 1700 = 2000
d) 300 + 124 = 424 424 - 67 = 357
e) 400 + 399 + 401 = 1200