Explicación paso a paso:
A. 3+4+5+2-4-7=3
B. 10(4-5+9)+20=10(8)+20=100
C. -[11+6-(-1)-(-19)]=-[11+6+1+19]=-37
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Explicación paso a paso:
A. 3+4+5+2-4-7=3
B. 10(4-5+9)+20=10(8)+20=100
C. -[11+6-(-1)-(-19)]=-[11+6+1+19]=-37