(7/4-7/8-7/12)/(-7/8)+(-7/8)/(7/4-7/8-7/12)加号前后的两个除法式子的运算有什么不同
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(7/4-7/8-7/12)/(-7/8)+(-7/8)/(7/4-7/8-7/12)
=7*(1/4-1/8-1/12)/(-7/8)+7*(-1/8)/[7*(1/4-1/8-1/12)]
=7*(-8/7)*(1/4-1/8-1/12)-(7*1/8)/[7*(1/4-1/8-1/12)]
=-8*(1/4-1/8-1/12)-(1/8)/(1/4-1/8-1/12)
=-8*(6/24-3/24-2/24)-(1/8)/(6/24-3/24-2/24)
=-8*1/24-(1/8)/(1/24)
=-1/3-1/8*24
=-1/3-3
=-3又1/3
=7*(1/4-1/8-1/12)/(-7/8)+7*(-1/8)/[7*(1/4-1/8-1/12)]
=7*(-8/7)*(1/4-1/8-1/12)-(7*1/8)/[7*(1/4-1/8-1/12)]
=-8*(1/4-1/8-1/12)-(1/8)/(1/4-1/8-1/12)
=-8*(6/24-3/24-2/24)-(1/8)/(6/24-3/24-2/24)
=-8*1/24-(1/8)/(1/24)
=-1/3-1/8*24
=-1/3-3
=-3又1/3
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