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-1/63÷(3/14一1/3一1/7+2/9)=?
题目详情
-1/63÷(3/14一1/3一1/7+2/9)=?
▼优质解答
答案和解析
-1/63÷(3/14-1/3-1/7+2/9)
=-1/63÷(3/14-3/9-2/14+2/9)
=-1/63÷(1/14-1/9)
=-1/63÷(9/126-14/126)
=-1/63÷(-5/126)
=-1/63×(-126/5)
=2/5
=-1/63÷(3/14-3/9-2/14+2/9)
=-1/63÷(1/14-1/9)
=-1/63÷(9/126-14/126)
=-1/63÷(-5/126)
=-1/63×(-126/5)
=2/5
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