周测培优卷8
周测培优卷8分数加减法(二)——分数加减混合运算及组合问题一、填空。(每空2分,共18分)1.在计算+时,要先算( )法,再算( )法。2.与的和再减去的差,列式是( ),结果是( )。3.在里填上合适的运算符号。4.从甲、乙、丙、丁四名同学中选出两名去做志愿者,共有( )种不同的选法。二、判断。(对的打“√”,错的打“×”)(每题2分,共10分)1.约分把分数变小,通分把分数变大。( )2.把和通分时,用120作为公分母计算起来最简便。( )3.西瓜成分中,水占,碳水化合物占,那么其他成分占。( )4.-=-=( )5.满足
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