Вычислите 42+61+28+39+30

Question

Вычислите 42+61+28+39+30

Comments

=(42+28)+(61+39)+30=70+100+30=(70+30)+100=100+100=200

Answer 1

42+61+28+39+30=200
1)42+61=103
2)103+28=131
3)131+39=170
4)170+30=200

Answer 2

42 + 61 + 28 + 39+ 30 = (42 +28) + (61 + 39) + 30 = 70 +30 + 100  = 200