人教版小学四年级上册数学口算笔算练习题61X50=271-2=719-8=30X91=698十5=20X96=926-7=73X81=267-5=42X48=478-8=570-4=655-9=54X60=54X77=26X96=80X85=808-7=227-9=56X90=21X25=505-5=69X37=84X17=732-8=姓名：714-6=16X32=499-4=904-8=17X38=134-9=617-2=120-6=406-4=31X22=683-5=54X19=79X71=437-9=48X98=508-4=70X57=91X43=244-7=61X82=77X12=26X87=142-7=794-3=970-4=时间：531-2=48X90=176-3=28X55=72X62=47X74=796-3=79X59=469-2=150-7=783-2=864-4=544-2=430-4=162-4=22X83=10X20=203-6=12X48=74X44=195-3=304-5=558-4=99X23=20X22=分数:255-3=92X83=312-4=621-8=860-3=12X23=93X19=39X18=399-4=36X63=651-3=53X89=947-4=59X76=28X67=77X35=95X92=16X85=98X76=32X28=87X14=62X17=232-5=423-6=670-6=\n