3)(1.2а^2-0.3б^2)(1.2а^2+0.3б^2)=1.44а^4-0.09б4
4)=4м^8-25н^4
2)=(5а-3б)^2
1)=(9а^3)^2-(7б^2)^2=(9а^3-7б^2)^2
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3)(1.2а^2-0.3б^2)(1.2а^2+0.3б^2)=1.44а^4-0.09б4
4)=4м^8-25н^4
2)=(5а-3б)^2
1)=(9а^3)^2-(7б^2)^2=(9а^3-7б^2)^2