Ответы на вопрос:
20-(7 1/3 - 6 7/8) : 3/4 - (5 1/4 - 4 21/40) : 1 9/20 = = 20 - (22/3 - 55/8) * 4/3 - (21/4 - 181/40) * 20/29 = = 20 - 11/24 * 4/3 - 29/40 * 20/29 = = 20 - 11/18 - 1/2 = = 20 - 11/18 - 9/18 = = 20 - 20/18 = = 20 - 1 1/9 = 18 8/9
20 - (7 1/3 - 6 7/8) : 3/4 - (5 1/4 - 4 21/40 ): 1 9/20= 18 8/9 1) 7 1/3 - 6 7/8= 22/3-55/8 = (176-165) /24 = 11/24 2) 5 1/4 - 4 21/40= (210 -181)/ 40 = 29/40 3) 11/24 : 3/4= 11*4/24*3= 11*1/6*3=11/18 4) 29/40 : 1 9/20 = 29/40 : 29/20 = 29/40* 20/29= 2/4=1/2 5) 20- 11/18 = 19 7/18 6) 19 7/18 - 1/2 = 19 7/18 - 9/18= 18 16/18 = 18 8/9
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