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a) (16-18)x[-7-(+5)-(-10)]x(4-16+3x5)+[6+8x(-2)+(-5)x(-2)]x(-1)=?calcul in lung!!
b)-10x{[(8-3x4)+(-7)]x(-7+6)+3x(-1)-4}=(-2-1)x(-3)=?calcul lung!!