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<?php
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if ($_SERVER['REQUEST_METHOD'] == 'GET' && isset($_GET['submit'])) {
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$r1 = floatval($_GET['r1']);
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$r2 = floatval($_GET['r2']);
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$r3 = floatval($_GET['r3']);
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$series = isset($_GET['series']);
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$parallel = isset($_GET['parallel']);
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if (!$series && !$parallel) {
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$msg = "Нужно выбрать что посчитать!";
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} else {
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$msg = "";
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if ($series) {
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$r = $r1 + $r2 + $r3;
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$msg .= "Последовательное: R = $r Ом\n";
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}
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if ($parallel) {
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$r = round(1 / (1/$r1 + 1/$r2 + 1/$r3), 4);
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$msg .= "Параллельное: R = $r Ом\n";
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}
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}
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}
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?>
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<form action="index.php" method="get">
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R1: <input type="number" name="r1" step="any" value="10"><br><br>
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R2: <input type="number" name="r2" step="any" value="20"><br><br>
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R3: <input type="number" name="r3" step="any" value="30"><br><br>
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<input type="checkbox" name="series"> Последовательное<br>
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<input type="checkbox" name="parallel"> Параллельное<br><br>
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<input type="submit" name="submit" value="Рассчитать">
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</form>
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<?php
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if (isset($msg)) {
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echo "<pre>$msg</pre>";
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}
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?>
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