145. Упростите выражение: а) (a® — Заb +6°) + (-a*+ Заb + b°); б) (x* +x+1) + (х? - x+ 1); в) (4k° + 2k + 1) + (-4k° + 2k – 1); г) (2mn - Зmn - Зmn) + (-тп + 5mn + бmn'); д) (2р – q - r) + (-р+ 2q - r) + (-р — q+ 2r); е) (4a* – 5а” + За – 2) + (За* — 4а + 5) + (2a® — 3 + 5а + 4а”); ж) (42° — 52'y+7гу – 8y")+(-32* + 52°у – 2гу* – Бу”); з) –(2ab° — ab + b) + Заb° — 4b – (5ab — ab°).​
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