a) (3 x 7 - 2 x 5):11 = (21-10):11 = 11:11 = 1
b) (13 x 12 - 5 x 14) x √19-15 = (156-70) x √4 = 86 x 2 = 172
c)√81+9x2+1 x(2x36-3x29) = √100 x (72-87) = 10 x (-15) = -150
d) (3x45+2x60-5x42): √(243-64x3-6)² = (135+120-210):√(243-192-6)²=45:√45² = 45:45=1
e)(2x75+6x52-2x31):(3x81-43)=(150+312-62):(243-43) = 400:200=2
Bafta multa!!!
