Question

3 Efectuați:
351 : 348 +231.33 +1220°;
13-3.[7-2.(5-3)];
a
b 34.72 +22 10-154",
d 12-110-10-19-8-9.(15-8)]}.
ct.​

Answer 1

Răspuns:

$\bf a)~ 3^{51} : 3^{48} +23^{1}\cdot 3^{3} +1220^{0}=$

$\bf~ 3^{51-48} +23\cdot 27 +1=$

$\bf~ 3^{3} +621 +1=$

$\bf~ 27 +621 +1=\red{\underline{~649~}}$

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$\bf b)~~ 3^{4}\cdot7^{2}+22^{1}\cdot 10^{3} - 154^{1}$

$\bf ~ 3^{4}\cdot7^{2}+22\cdot 1000 - 154=$

$\bf ~ 81\cdot49+22000 - 154=$

$\bf ~3969+22000-154=$

$\bf ~25969-154=\purple{\underline{~25815~}}$

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c) 13 - 3 × [7 - 2 × (5 - 3)] =

13 - 3 × (7 - 2 × 2) =

13 - 3 × (7 - 4) =

13 - 3 × 3 = 13 - 9 = 4

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d) 12 × {110 - 10 × [9 × 8 - 9 × (15 - 8)]} =

12 × [110 - 10 × (9 × 8 - 9 × 7)] =

12 × [110 - 10 × (72 - 63)] =

12 × (110 - 10 × 9) =

12 × (110 - 90) =

12 × 20 = 240