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(30+3)+7x8
33+56
89
B). 64/8x3-(48/2+1-1)
64/8x3-(24+1-1)
64/8x3-(25-1)
64/8x3-24
8x3-24
24-24
0
C). {5+(8x3/6)-7}
{5+(8x2)-7}
{5+16-7}
{21-7}
14
Te ayudo después si quieres las demás operaciones resueltas