beserta cr krjanya please bsok udah dikumpulin

1. 7.10^-6 × 45.10^-4
= 315.10^-6+(-4)
= 315.10^-10
2. 5.10^-4 × 36.10^8
= 180.10^-4+8
= 18.10^5
3. 725.10^6 ÷ 25.10^-5
= 29.10^11
4. 72.10^-5 ÷ (4÷12.10^3)
= 72.10^-5 ÷ 3.10^3
= 24.10^-8

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