小学一年级数学下册同步练习题（四）
<p> 一、口算。</p><p>1 + 9 = 2 + 1 = 2 + 2 = 3 – 2 =</p><p>1 + 1 = 4 – 1 = 2 – 1 = 4 – 2 =</p><p>5 – 1 = 1 + 3 = 4 – 3 = 1 + 4 =</p><p>5 – 4 = 3 – 3 = 4 + 0 = 0 + 2 =</p><p>3 – 0 = 4 – 0 = 0 + 0 = 10 – 8 =</p><p>二、数一数。</p><p></p><p></p><p></p><p></p><p></p>
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