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2)-34
3)-24
4)8
esas son las respuestas
2.(-19+21)×-2+(32-42)×3= (-2)x-2+(-10)x3=4-30= -26
3.-18+25-(-23+54)= -18+25+23-54= -18-54+25+23=-72+48=-24
4.-2×(5-3)+4×(-7+10)= -2x2+4x(3)= 4+12=16