Ответ:
.................
1) 5|||| (12,8+8,2)•(12,8-8,2)=21•4,6=96,62)
3|||| 8,4•6+8,4:6=50,4+1,4=51,8
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Ответ:
.................
1) 5|||| (12,8+8,2)•(12,8-8,2)=21•4,6=96,62)
3|||| 8,4•6+8,4:6=50,4+1,4=51,8
..................