a- 7×4×10²
b- 120÷4=30
c- 5×10³/ 2×10×10-² ⇔5/2 ×10"4"
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a- 7×4×10²
b- 120÷4=30
c- 5×10³/ 2×10×10-² ⇔5/2 ×10"4"