Răspuns:
a) [1+(5×7-2×15)]÷2×(2×8-15)÷[3÷(1+14÷7)+2]
=[1+(35-30)]÷2×(16-15)÷[3÷(1+2)+2]
=(1+5)÷2×1÷(3÷3+2)
=6÷2÷(1+2)
=3÷3
=1
b)98+8×[1004-4×(8÷2×2-4÷4×2)]
=98+8×[1004-4×(4×2-1×2)]
=98+8×[1004-4×(8-2)]
=98+8×(1004-4×6)
=98+8×(1004-20)
=98+8×984
=98+7872
=7970
c)[1+2×(6+6÷3)-5]÷6
=[1+2×(6+2)-5]÷6
=(1+2×8-5)÷6
=(1+16-5)÷6
=(17-5)÷6
=12÷6
=2
Sper că te-am ajutat!