[tex]\displaystyle\bf\\1)\\\\(-ab)^{30} \cdot(-ab)^{2} :(-ab)^{31} -5ab=(ab)^{30} \cdot(ab)^{2} :\Big[-(ab)\Big]^{31} -5ab=\\\\\\=-(ab)^{30+2-31} -5ab=-ab-5ab=-6ab\\\\\\2)\\\\3-2(a-2,5a^{2} )+4(0,5a-3)=3-2a+5a^{2} +2a-12=5a^{2} -9[/tex]
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[tex]\displaystyle\bf\\1)\\\\(-ab)^{30} \cdot(-ab)^{2} :(-ab)^{31} -5ab=(ab)^{30} \cdot(ab)^{2} :\Big[-(ab)\Big]^{31} -5ab=\\\\\\=-(ab)^{30+2-31} -5ab=-ab-5ab=-6ab\\\\\\2)\\\\3-2(a-2,5a^{2} )+4(0,5a-3)=3-2a+5a^{2} +2a-12=5a^{2} -9[/tex]