1.Упростите буквенное выражение:
а) 7х-5-4(2х-9)=
б)5(х-3)-(6х-11)=
в)х-7-3(2х-8)=
г)6(2х+3)-4(7х-20)=
2.Раскройте скобки и вычислите:
в) 136 + (6,3 + 64) =
г) (3,7 + 4,96) —(3,7 — 3,04) =
д) —7,8 — (5,39 — 12,8) =
е) (3,91 — 6,57) + (6,57 — 2,91) =
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