1
А. 5м²+25м-м³-5м²=25м-м³
Б. А³-2А²В+6АВ²+4А²В-8АВ²+24В³=А³+2А²В-2АВ²+24В³
2
15х²-(3х+2)(5х-4)=-6
15х²-(15х²-12х+10х-8)=-6
15х²-15х²+2х+8=-6
2х=-14
х=-7
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Answers & Comments
1
А. 5м²+25м-м³-5м²=25м-м³
Б. А³-2А²В+6АВ²+4А²В-8АВ²+24В³=А³+2А²В-2АВ²+24В³
2
15х²-(3х+2)(5х-4)=-6
15х²-(15х²-12х+10х-8)=-6
15х²-15х²+2х+8=-6
2х=-14
х=-7