input:n1(5,1,30,1),n2(10,1,30,1),n3(20,1,60,1),n4(30,1,60,1); ma1:=ma(c,n1); ma2:=ma(c,n2); ma3:=ma(c,n3); ma4:=ma(c,n4);明叉12:=(ma2-ma1+ref(c,n1-1)/n1-ref(c,n2-1)/n2) *n1*n2/(n2-n1);差12:明叉12-c,color0000ff,linethick0,PRECISION2;明叉13:=(ma3-ma1+ref(c,n1-1)/n1-ref(c,n3-1)/n3)*n1*n3/(n3-n1);差13:明叉13-c,color00ffff,linethick0,PRECISION2;明叉23:=(ma3-ma2+ref(c,n2-1)/n2-ref(c,n3-1)/n3)*n2*n3/(n3-n2);差23:明叉23-c,colorffff00,linethick0,PRECISION2;明叉24:=(ma4-ma2+ref(c,n2-1)/n2-ref(c,n4-1)/n4)*n2*n4/(n4-n2);差24