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b.3/7+4/21-13/10=90/210+40/210-273/210=-143/210
c.22/5-4/3-11/4=244/60-80/60-165/60=-1/60
d.41/4+5/3+167/8=1082/96+160/96+1904/96=3146/96=1573/48
e.2,25+25%+3/2=225/100+25/100+3/2=225/100+25/100+60/100=310/100=31/10
semoga membantu,koreksi jawabannya,&maaf klo salah.