1.计算:1又7/8÷(-10)×(-3又1/3)÷(-3又3/4)
2.一个数与1又3/20的积是-4又19/20,求这个数?
计ç®ï¼
1å7/8÷ï¼-10ï¼Ãï¼-3å1/3ï¼Ã·ï¼-3å3/4ï¼
=-ï¼15/8Ã4/15ï¼Ãï¼1/10Ã10/3ï¼
=-1/2Ã1/3
=-1/6
2.ä¸ä¸ªæ°ä¸1å3/20ç积æ¯-4å19/20ï¼æ±è¿ä¸ªæ°ï¼
-4å19/20÷1å3/20
=-4.95÷1.15
=-99/23
=-4å7/23
1å7/8÷ï¼-10ï¼Ãï¼-3å1/3ï¼Ã·ï¼-3å3/4ï¼
=-ï¼15/8Ã4/15ï¼Ãï¼1/10Ã10/3ï¼
=-1/2Ã1/3
=-1/6
2.ä¸ä¸ªæ°ä¸1å3/20ç积æ¯-4å19/20ï¼æ±è¿ä¸ªæ°ï¼
-4å19/20÷1å3/20
=-4.95÷1.15
=-99/23
=-4å7/23
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第1个回答 2013-10-04
1又7/8÷(-10)×( -3又1/3)÷(-3又3/4)
=15/8÷(-10)X(-10/3)÷(-15/4)
=15/8 X 100/3 X (-4/15)
=-1/2X100/3
= -50/3
X · 23/20= -99/20
X= -99/23
=15/8÷(-10)X(-10/3)÷(-15/4)
=15/8 X 100/3 X (-4/15)
=-1/2X100/3
= -50/3
X · 23/20= -99/20
X= -99/23