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80 × 1000 × 10^-5
2) 1,05 × 0,046
= 1,05 × 4,6 × 10-²
= 4,83 × 10-²
3) 0,0634 × 3.000
= 6,34 × 10-² × 3 × 10³
= 1,8
4)L = s²
= 8,7 × 8,7
= 75,69 cm²
5) L = 9,6 × 6,4
= 61,44 cm²