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B)12½m-1¼n²-1.6)-(2¼m²+3¾n²+2.4)=25/2m²-5/4n²-1.6-9/4m²+15/4n²-2,4=41/4m²+10/4n²-3=10¼m²+2½n²-3
C)(1,5x²y-¾x²-15)-(⅖x²y-2⅔-⅛x²)=1½x²y-¾x²-15-⅖x²y-8/3-⅛x²=3/2x²y-¾x²-15-⅖x²y-8/3-⅛x²=11/10x²y-7/8x²-17⅔