=-4аˣ(-5а²)-4аˣ2а-4аˣ(-1)=20а³-8а²+4а
=-3х₃ˣ(2а-3х)=-6ах³+9х⁴
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=-4аˣ(-5а²)-4аˣ2а-4аˣ(-1)=20а³-8а²+4а
=-3х₃ˣ(2а-3х)=-6ах³+9х⁴