1 . Oblicz a) 11+ (-12) + 39 + 9 - 8 = b) 45 + ( -9) + (-91) +5 = c ) -4i1/2 + 1/6 + ( - 1/2 ) + 1i1/3 = d) 6,25 + ( - 1/4) + ( - 3/5 ) + 0,75 Proszę o pomoc

a) = 39 b) = -50 c) = -2½ d) = 6,15

a)11+(-12)+39+9-8=21 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

a) 11+ (-12) + 39 + 9 - 8 =11-12+39+9-8=39 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