Помогите пожалуйста,математика ,деление дробей
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№ 781) 3/4 : 5/7 = 3/4 * 7/5 = 21/20 = 1 1/202) 5/18 : 25/27 = 5/18 * 27/25 = 1/2 * 3/5 = 3/103) 9/16 : 3/64 = 9/16 * 64/3 = 3/1 * 4/1 = 3/44) 25/72 : 45/63 = 25/72 * 63/45 = 5/8 * 7/9 = 35/72 № 798 : 4/5 = 8/1 * 5/4 = 2 * 1 = 21 : 7/16 = 1/1 * 16/7 = 16/7 = 2 2/78/15 : 24 = 8/15 * 1/24 = 1/15 * 1/3 = 1/4512 1/2 : 3 3/4 = 25/2 : 15/4 = 25/2 * 4/15 = 5/1 * 2/3 = 10/3 = 3 1/31 3/5 : 5 1/3 = 8/5 : 16/3 = 8/5 * 3/16 = 1/5 * 3/2 = 3/10 = 0,32 5/8 : 7/32 = 21/8 : 7/32 = 21/8 * 32/7 = 3/1 * 4/1 = 12№ 801) 2 1/4 : 3/8 : 1/ 2 = 9/4 * 8/3 * 2/1 = 3/1 * 2/1 * 2/1 = 122) 2 1/4 : (3/8 : 1/2) = 9/4 : (3/8 * 2/1) = 9/4 : 6/8 = 9/4 * 8/6 = 3/1 * 2/2 = 33) (6 3/4 - 5 1/8 : 1 9/32) : 2 1/5 = 5/4 = 1 1/4         1) 5 1/8 : 1 9/32 = 41/8 : 41/32 = 41/8 * 32/41 = 1/1 * 4/1 = 4          2) 6 3/4 - 4 = 6 3/4 - 3 4/4 = 5 7/4 - 3 4/4 = 2 3/4          3) 2 3/4 : 2 1/5 = 11/4 : 11/5 = 11/4 * 5/11 = 5/44) (3 1/4 + 2 1/6) : 2 3/5 - 2/3  : 4/9 = 11           1) 3 1/4 + 2 1/6 = 3 3/12 + 2 2/12 = 5 5/12            2) 5 5/12 : 2 3/5 = 65/12 : 13/5 = 65/12 * 5/13 = 5/12 * 5/1 = 25/2            3) 2/3 : 4/9 = 2/3 * 9/4 = 1/1 * 3/2 = 3/2             4) 25/2 - 3/2 = 22/2 = 11№ 811) 6/5х = 3/5     х = 3/5 : 6/5     х = 3/5 * 5/6     х = 1/22) 4/7х = 1    х = 1 : 4/7    х =  7/4 = 1 3/43) 3/4х = 12    х = 12 : 3/4    х = 12/1 * 4/3    х = 164) 3х = 2/3     х = 2/3 : 3     х = 2/3 * 1/3     х = 2/95) х : 7/15 = 15/28    х = 15/28 * 7/15    х = 1/46) 5 1/4 : х = 7/8    х = 5 1/4 : 7/8    х = 21/4 : 7/8    х = 21/4 * 8/7    х = 3/1 * 2/1    х = 6