用简便方法计算: ①3-12/13-11/23 ②7/16-(3/16+1/9)急就急
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![用简便方法计算: ①3-12/13-11/23 ②7/16-(3/16+1/9)急就急](/uploads/image/z/34140-12-0.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A+%E2%91%A03-12%2F13-11%2F23+%E2%91%A17%2F16-%283%2F16%2B1%2F9%29%E6%80%A5%E5%B0%B1%E6%80%A5)
用简便方法计算: ①3-12/13-11/23 ②7/16-(3/16+1/9)急就急
用简便方法计算: ①3-12/13-11/23 ②7/16-(3/16+1/9)
急就急
用简便方法计算: ①3-12/13-11/23 ②7/16-(3/16+1/9)急就急
①3-12/23-11/23
=3-(12/23+11/23)
=3-1
=2
②7/16-(3/16+1/9)
=7/16-3/16-1/9
=4/16-1/9
=1/4-1/9
=5/36