(1/2-1/4)÷(1-3/4*4/5)怎么做?
问题描述:
(1/2-1/4)÷(1-3/4*4/5)怎么做?
还有1-(5/7+3/14÷3/4)*2/7
答
(1/2-1/4)÷(1-3/4*4/5) =(2/4-1/4)÷(1-3/5) =(1/4)÷(2/5) =(1/4)*(5/2) =5/81-(5/7+3/14÷3/4)*2/7=1-(5/7+(3/14)*(4/3))*2/7 =1-(5/7+2/7)*2/7 =1-2/7 =5/7
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