№ 1
упрости выражение :
а)2,5 +(13-15)-b
б) 2,5b + (13b -15b)-b
в)18 + (-20-8)-n
№2
найди значение выражения :
а) -8m + 4m -7m + n-2n-5n,
если m = 3 ;
n=-0,3
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