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Answers for “该系统的最终解是什么?”

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The solution is checked in the other original equation to confirm that the ordered pair satisfies the entire system, not just the single equation used for back-substitution. If the pair was found by substituting into the first equation, checking it in the second equation verifies that both equations are simultaneously true for those values.

Conditions: A candidate ordered pair has been found.; At least one original equation remains available for substitution checking.; The equation used for back-substitution is not reused for the check.

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The fraction 2220\frac{22}{20} simplifies to 1110\frac{11}{10} by dividing both the numerator and the denominator by their greatest common factor, which is 2. Since 22÷2=1122 \div 2 = 11 and 20÷2=1020 \div 2 = 10, the reduced fraction is 1110\frac{11}{10}.

Conditions: The numerator (22) and denominator (20) share a common factor greater than 1.; The same nonzero factor (2) divides both the numerator and the denominator.

Understand why

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The equation is multiplied by 3 to clear the denominators and eliminate the fractions. Since the denominators present are 1 and 3, the common denominator is 3.

Conditions: The equation contains fractional terms with denominators 1 and 3.; All terms on both sides of the equation are multiplied by the same nonzero number (3).