计算(简便计算、用四年级的)判断:102x56 改正:864-299=100x56+2 =864-300-1=5600+2 =564-1=5602 (x或√) =563 (x或√) 简便计算:25x24= 125x32= 540|2|27= 8900|25|4= 2000|8|125= 99x36+36= 735-208= 243-95= 245-125+355-1
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![计算(简便计算、用四年级的)判断:102x56 改正:864-299=100x56+2 =864-300-1=5600+2 =564-1=5602 (x或√) =563 (x或√) 简便计算:25x24= 125x32= 540|2|27= 8900|25|4= 2000|8|125= 99x36+36= 735-208= 243-95= 245-125+355-1](/uploads/image/z/465526-46-6.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%88%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E3%80%81%E7%94%A8%E5%9B%9B%E5%B9%B4%E7%BA%A7%E7%9A%84%EF%BC%89%E5%88%A4%E6%96%AD%EF%BC%9A102x56+%E6%94%B9%E6%AD%A3%EF%BC%9A864-299%3D100x56%2B2+%3D864-300-1%3D5600%2B2+%3D564-1%3D5602+%EF%BC%88x%E6%88%96%E2%88%9A%EF%BC%89+%3D563+%EF%BC%88x%E6%88%96%E2%88%9A%EF%BC%89+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%EF%BC%9A25x24%3D+125x32%3D+540%7C2%7C27%3D+8900%7C25%7C4%3D+2000%7C8%7C125%3D+99x36%2B36%3D+735-208%3D+243-95%3D+245-125%2B355-1)
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