490/35怎样简便计算
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![490/35怎样简便计算](/uploads/image/z/53627-59-7.jpg?t=490%2F35%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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490/35怎样简便计算
490/35怎样简便计算
490/35怎样简便计算
490/35
=7 *7*10/7*5
=7*5*2/5
=7*2
=14
35*14 =7*5*2*7 =7*10*7 =490 =35*2*7=70*7=490 35*14=7*5*7*2=7*7*10=490 乘法结合律:35×14=35×2×7=70×7=
490/35
=7×7×10÷7×5
=7×5×2÷5
=7×2
=14