先化简再求值(1-3m)/2-(2m+5)/3+(3-2m)/4其中 m=1/10
=(6-18m)/12-(8m+20)/12+(9-6m)/12
=(6-18m-8m-20+9-6m)/12
=(-32m-5)/12
=-(32×1/10+5)/12
=-8.2/12
=-82/120
=-41/60;
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