7.5×10−4
7.5×10−3
7.5×10−2
7.5×10−1
Correct answer is B
(0.3×105)÷(0.4×107)310×105÷410×107=3×104÷4×1063×1044×107=34×10−2=0.75×10−27.5×10−3
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