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b)-5¼.(-2³/₇) =-21/4*(-17/7)=51/4=12 i 3/4
d)-3²/₇:2⅓ =-23/7:7/3=-23/7*3/7=-69/49=-1 i 20/49
e)-9⁴/₁₅:(-¹³⁹/₁₅)=-139/15*(-15/139)=1
b)=-21/4*(-17/7)=51/4=12 3/4
d)=-23/7*3/7=-69/49=-1 20/49
e)=-139/15*(-15/139)=1