Решите 1) (х-5)²-(х-5)(х+5)=30 2)12х²-5х+(1+3х)(1-3х)-3(х-2)(х+3)-6=21 - вопрос №355183215553021251313323621 от mariyayakovleva1 22.04.2022 05:45

Question

Алгебра: Решите 1) (х-5)²-(х-5)(х+5)=30 2)12х²-5х+(1+3х)(1-3х)-3(х-2)(х+3)-6=21

mariyayakovleva1 · Answer

1)Х²-10Х+25-Х²-5Х+5Х+25=30-10Х=30-25-25-10Х=-20Х=-20÷(-10)Х=22)12Х²-5Х+1-3Х+3Х-9Х²-3Х²-9Х+6Х+18-6=2112Х²-5Х-3Х+3Х-9Х²-3Х²-9Х+6Х=21-1-18+6-8Х=8Х=8÷(-8)Х=-1...