Page 20 - คณิตศาสตร์-ชั้นป5(เศษส่วนที่เท่ากันและเศษส่วนอย่างต่ำ)
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7         20
            2.         กับ
                   8         24
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                    12         4
             3.          กับ
                    15         5
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