19/7-(-89/21+25/7-1/3) 脱式计算
问题描述:
19/7-(-89/21+25/7-1/3) 脱式计算
答
19 / 7 - ( - 89 / 21 + 25 / 7 - 1 / 3 )
= 57 / 21 + 89 / 21 - 75 / 21 + 7 / 21
= (57 + 89 - 75 + 7)/ 21
= (153 - 75)/ 21
= 78 / 21
= 26 / 7
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