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(-3,4)+15/11+(-1,6)+7+(-1 4/11)=
=(-34/10)+15/11+(-16/10)+7/1+(-15/11)=
=(-374/110)+150/110-176/110+770/110-150/110=
=220/110=
=2
b)
[(-1/5)³:0,32-(-2 1/2)²]-(-28+52,4)=
=[(-1/125):32/100-25/4)]-24,4=
=(-1/125*100/32-25/4)-24 4/10=
=(-1/40-25/4)-244/10=
=(-1/40-250/40)-244/10=
=-251/40-244/10=
=-251/40-976/40=
=-1227/40=
=-30,675
Proszę :) Mam nadzieję, że pomogłam :) Powodzenia!