Спростіть вираз:

1) 2 ∙ 9а ∙ 50 – 345а; 2) 2,4b – 1,52b + 4,52b;

3) 8а ∙ 0,005 ∙ 4b ∙ 125; 4) 1,5(с + 1,2) + 5,4с – 1,8.
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