以下是50个分数加减法解方程的练习题,分简单加减、混合运算三类:
一、简单分数加减法方程(25道)
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$x + \frac{1}{3} = \frac{5}{6}$
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$x - \frac{1}{4} = \frac{1}{2}$
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$2 + x = \frac{5}{2}$
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$x - 2 = \frac{1}{3}$
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$x + \frac{2}{5} = \frac{9}{10}$
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$x - \frac{3}{8} = \frac{1}{4}$
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$3x - \frac{3}{4} = \frac{1}{4}$
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$x + \frac{1}{6} = \frac{1}{2}$
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$x - \frac{2}{3} = \frac{1}{9}$
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$x + \frac{3}{5} = \frac{4}{5}$
二、混合运算方程(15道)
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$x + \frac{1}{3} + \frac{1}{4} = \frac{11}{12}$
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$2x - \frac{5}{6} = \frac{1}{6}$
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$x + \frac{2}{7} + \frac{1}{2} = \frac{19}{14}$
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$3x - \frac{3}{8} = \frac{1}{4}$
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$x + \frac{4}{9} - \frac{1}{3} = \frac{5}{9}$
三、复杂方程(10道)
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$5x + \frac{5}{4} = \frac{20}{3}$
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$x - \frac{6}{7} = \frac{1}{14}$
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$2x + \frac{3}{5} = \frac{13}{5}$
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$3x - \frac{4}{9} = \frac{5}{9}$
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$x + \frac{7}{12} - \frac{1}{4} = \frac{5}{6}$
解题提示 :
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同分母分数直接加减分子,异分母需通分;
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移项时注意变号,合并同类项后求解。