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199又1/9X1/8+599又1/7X1又1/6-201又1/9X9/10-601又1/7X7/8
题目详情
199又1/9X1/8+599又1/7X1又1/6-201又1/9X9/10-601又1/7X7/8
▼优质解答
答案和解析
199又1/9X1/8+599又1/7X1又1/6-201又1/9X9/10-601又1/7X7/8
=(200-8/9)x1/8+(600-6/7)x7/6-(200+10/9)x9/10-(600+8/7)x7/8
=200x1/8-8/9x1/8+600x7/6-6/7x7/6-200x9/10-10/9x9/10-600x7/8-8/7x7/8
=25-1/9+700-1-180-1-625-1
=(700-180-600)-3-1/9
=-83又1/9
=(200-8/9)x1/8+(600-6/7)x7/6-(200+10/9)x9/10-(600+8/7)x7/8
=200x1/8-8/9x1/8+600x7/6-6/7x7/6-200x9/10-10/9x9/10-600x7/8-8/7x7/8
=25-1/9+700-1-180-1-625-1
=(700-180-600)-3-1/9
=-83又1/9
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