3.15
a) ad - bd + 7а - 7b;
в) ab + ac + 8b + 8с;
д) аb - а +b -1;
ж) bс - c-6b + 6;
13.16
a) ху + уz+ х*2 + хz;
в) m*2+ bm + mn + bn;
д) а*2 - аb - 5а + 5b;
ж) 2с*2 - 7сd -Зс + 3d;
и) х*3 - Зх*2+ х - 3;
л) а*2- 5аb - 2а + 10b;
3.19
а) (а - 2)*2 - 9;
г) 9 - (у + 2)*2;
ж) 36х*2 - (3х - 1)*2;
3.30
а) (2а - 36)*2 - (а + 2b)*2;
б) (x*2 -1)*2 - (3х*2 + 2)*2;
в) 81а*2 - 16(2а -3b)*2;
г) (5m - 2n)*2 -9(4m-n)*2.
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