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alholod2p00me0
30.12.2022 06:18
Математика
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562. При каких значениях хверно равенство: а) 3(х + 5) = 3х + 15; r) (x + 2). 4 = 2.4 + 2.4; б) (3 + 5) х = 3х + 5x; B) (7 + x) .5 = 7.5 + 8.5; д) (5 – 3) х = 5х – 3x; е) (5 – 3) х = 5х – 3 : 2? -

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VarvaraErrorFell
VarvaraErrorFell
4,4(4 оценок)

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лппериоаоаопоопо
лппериоаоаопоопо
4,6(92 оценок)
D=-17-(21)=4 c₈=c₁+7d=-21+7*4=7 c₂₀=c₁+19d=-21+19*4=55 с  первого  по двадцатый  член всего 13 членов⇒s₁₃=(c₈+c₂₀)÷2*13==(7+55)÷2*13=403

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