1)Упростите выражение: (2m4+5m3n-3m2n2-mn3)-(3m4-8m3n+2m2n2-6mn3)
2)Упростите выражение: (а-b)3+b3 помогите!!
1) (2m4+5m3n-3m2n2-mn3)-(3m4-8m3n+2m2n2-6mn3)=(8m+15mn-12mn-3mn)-(12m-24mn+8mn-18mn)=8m+15mn-12mn-3m-12m+24mn+8mn-18mn=-7m+17mn=17mn-7m.
2) (a-b)3+b3=3a-3d+3b.
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1) (2m4+5m3n-3m2n2-mn3)-(3m4-8m3n+2m2n2-6mn3)=(8m+15mn-12mn-3mn)-(12m-24mn+8mn-18mn)=8m+15mn-12mn-3m-12m+24mn+8mn-18mn=-7m+17mn=17mn-7m.
2) (a-b)3+b3=3a-3d+3b.