3. n(7-m) + k(7–m);
4. 8m2n – 4mn3 ;
5. a(b-c)+3(b-c).
6. 6а+9х;
7. ay–ax;
8. a2 –a³b;
9. 9n + 6m;
4. 8m2n – 4mn3 ;
5. a(b-c)+3(b-c).
6. 6а+9х;
7. ay–ax;
8. a2 –a³b;
9. 9n + 6m;
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Answers & Comments
3)7n-mb+7k-km =7(n+k)-m(b+k)
4) 2n4m(2m-n)
5) ab-ac+3b-3c= b(a+3)-c(a+3)=(a+3)(b-c)
6)3(2a+3x)
7) a(y-x)
8) a2(1-ab)
9)3(3n+2m)