3/5 : (-3 11/15) : (-7/60) * 1 2/3 = я решила 2 дествия, а третье не могу 9 2/7 * 3 8/15 + 1 7/15 * 9 2/7 - 6 2/7 * 5 = помогите

3/5 : (-3 11/15) : (-7/60) * 1 2/3 = 3/5 : (-56/15) : (-7/60) * 5/3 = 3/5 * (-15/56) : (-7/60) * 5/3 = (-9/56) : (-7/60) * 5/3 =

(-9/56) * (-60/7) * 5/3 = 9/14 * 15/7 * 5/3 = 135/98 * 5/3 = 225/98

9 2/7 * 3 8/15 + 1 7/15 * 9 2/7 - 6 2/7 * 5 = 65/7 * 53/15 + 22/15 * 65/7 - 44/7 * 5 = 65/7 * (53/15 + 22/15) - 44/7 * 5 = 65/7 * 5 - 44/7 * 5 = 5 * (65/7 - 44/7) = 5 * 21/7 = 5*3 = 15