Помогите пожалуйста
a) 2 kg 400 g + 3 kg 600 g;
c) 6t 500 kg + 500 kg;
e) 2 h 30 min + 30 min;
g) 6h 45 min + 2h 35 min;
b) 3 kg 700 g- 800 g:
d) 4t 800 kg: 8;
f) 8h 50 min + 12h 40 min
h) 7h 35 min - 45 min.​
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