四年级下册数学单元测试-第六单元-苏教版
http://t.cn/Ri466E4第六单元演练一、填空题。1.根据运算律在里填上合适的数。48+62= +48 28×16= ×2867+58+33=( + )+588×4×25=8×( × )(28+25)×4= ×4+ ×42.如果用a和b分别表示两个数,加法交换律可以表示为( ),乘法交换律可以表示为( )。3.根据“a×b=80”填空。[来源:Z|xx|k.Com]若a不变,b除以10,则积是( );若b不变,a乘10,则积是( );若a乘4,b除以4,则积是( )。二、判断题。(对的画“√”,错的画“✕”)、1.25×8×4×125=(25×4)+(125...
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