1/4*(-5/3)+2/7*(-5/12)-5/12*5/7
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![1/4*(-5/3)+2/7*(-5/12)-5/12*5/7](/uploads/image/z/11795006-38-6.jpg?t=1%2F4%2A%28-5%2F3%29%2B2%2F7%2A%28-5%2F12%29-5%2F12%2A5%2F7)
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1/4*(-5/3)+2/7*(-5/12)-5/12*5/7
1/4*(-5/3)+2/7*(-5/12)-5/12*5/7
1/4*(-5/3)+2/7*(-5/12)-5/12*5/7
1/4*(-5/3)+2/7*(-5/12)-5/12*5/7
=-5/12+2/7*(-5/12)-5/12*5/7
=-(5/12)*(1+2/7+5/7).提取公因式-5/12
=-(5/12)*(1+1)
=-(5/12)*2
=-5/6