a,1/2-(1/3+1/10)= b,1/3-[(-5/4)-(1/4+3/8)]= c,-1/12.-4/33.54/-25.-5/6= d,1/3.4/5+1/3.6/5= 5/31.21/25+5/21.-7/10-5/31.9/20=

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