Problem : Compute 3.45×1016 + 9.80×1018 .
Problem : Compute 6.12×10-2 -4.9×10-4 .
Problem : Compute 4.0219×104 +6×10-3 .
Problem : Compute 6.1×102 -4.38×104 .
Problem : Compute 9.9×10-18 +4.2×10-19 .
Problem : Compute 1.02×1012 - 4.5×1010 .
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