liulang__1983
幼苗
共回答了21个问题采纳率:90.5% 举报
因为:|2a-b|+(3b-2)=0 所以得:2a-b=0;3b-2=0 解得:a=1/3,b=2/3;代入下式 1/2(a-b)+1/4(a+b)+(a+b)/3-(a+b)/6 =a/2-b/2+a/4+b/4+a/3+b/3-a/6-b/6 =a(1/2+1/4+1/3-1/6)+b(-1/2+1/4+1/3-1/6) =ax11/12-b/12 =(1/3)x(11/12)-(2/3)x(1/12) =1/4
1年前
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