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Answer:
1. Answer 1'000'000.
_____________________
2. Answer 80 ➕ {48 ➖ (4×3)}÷3
= 80 ➕ {48 ➖ 12}÷3
= 80 ➕ 36÷3
= 80 ➕ 12
= 92
_____________________
3. Answer factor a) 28
= 14²
b) 16
= 4²
______________________
4. Answer 171 ➖ 1 ➖ 1
= 169
b) 1 ➖ 7 ➖ 31
= ➖ 37
______________________
5. Answer a) 8.31 + 43.11
= 51.42
b) 78.44 + 0.66
= 79.1
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