№1

раскройте скобки и найдите значение выражения:

-3,1+(-2,8-4,1)-(2 1/3-5/6)

№2

упростие выражения:

а)а*(-0,25б)*(-0,8с)

б)(7а-3)-(-8-2а)

в)-2(0,5х-1,4у)+2х+3,2у

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