SOOOS!!! Докажите тождество
а) -х(х-а)(х+b)=x(a-x)(b+x)
б) 36-(-(9с-15))=3(3с+7)
в) у(-2-(у-4))=у(2-у)
г) (а-11)(а+10)+10=(а-5)(а+4)-80
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