a) 0.0000072 ÷ 0.09
b) 15.3 ÷ 0.000017
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Answer:
a) 0.0000072÷0.09
=72×10^-7÷9×10^-2
=8×10^(-7+2)
=8×10^-5
=0.00008
b)15.3÷0.000017
=153×10^-1÷17×10^-6
=9×10^(-1+6)
=9×10^5
=900000
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