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b) = -50
c) = -2½
d) = 6,15
b)45+(-9)+(-91)+5=-50
c)-41/2+1/6+(-1/2)+1 1/3=-3 1/2
d)6.25+(-1/4)+(-3/5)+0.75=7 7/20
b) 45 + ( -9) + (-91) +5 =45-9-91+5=50
c ) -4i1/2 + 1/6 + ( - 1/2 ) + 1i1/3 =-4i4/12+2/12-6/12+1i4/12=-6i6/12=-3i1/2
d) 6,25 + ( - 1/4) + ( - 3/5 ) + 0,75=6i5/20-5/20+12/20+15/20=6i27/20=7i7/20