упростите выражение и найдите его значение
1) 3X(2x-5)-8x(4x-3) если x=-1
2)2x(14x-x+5)+4x(2.5+3x-7x^2) если x=7
3)8ad(a^2-2b^2)-7a(a^2 b-3b^3) если a=3 b=2
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