1)2 1/2×(2/15-3 5/6)-2 3/4= 2) -1 1/7×(6 5/6+4 2/3)= 3) (6 3/8-2 3/4)×(-4)+7/18×9= 4) 9 1/6:(4 1/3-8)+24×3/8=
Помогите пожалуйста.Заранее спасибо.
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