5/7+1/4-9/14 3/4+3/6-5/8 5/9+(3/4-1/2) 1/10+3/8-2/5 3/5-(2/15+1/3)简便运算
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咨询记录 · 回答于2022-05-11
5/7+1/4-9/14 3/4+3/6-5/8 5/9+(3/4-1/2) 1/10+3/8-2/5 3/5-(2/15+1/3)简便运算
你好, 5/7+1/4-9/14 =1/4+(5*2-9)/14 =1/4+1/14 =(1*14+1*4)/(4*14) =18/56 =9/28 3/4+3/6-5/8=18/24+12/24-15/24 =15/24 =5/85/9+(4/3-2/1) =10/18+24/18-36/18 =-2/18 =-1/91/10+3/8-2/5=19/40-2/5=3/40 3/5-(2/15+1/3)=9/15-2/15-5/15 =2/15