(1)75μm= = m(2)15cm= = km(3)240dm= = km(4)0.36mm= = nm

(1)75μm= = m(2)15cm= = km(3)240dm= = km(4)0.36mm= = nm

第一個75*10^-6,第二個1.5*10^-4,第三個0.024,第四個0.36*10^-6,