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b)-21+16-3-12+24=4
c) 13,5-24+2,5-5,3+3,2=-10,1
d) -3,6+2 3/7-1,4-(-11/7)= -5+2 3/7 + 11/7 = 5+ 14/7 = 5+2=7
e)-5,75+42/3-21/4-(-3 1/3)=-5,75 + 42/3 - 21/4 + 31/3 = -5,75 + 168/12 - 63/12 + 124/12 = -5,75 + 229/12 = -5,75+ 19 1/12= -5 3/4 + 19 1/12 = -5 9/12 + 19 1/12 = -69/12 + 229/12 = 160/12 = 13 4/12 = 13 1/3
mam nadzieje ze pomoglam
pozdrawiam.;)