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2. 12 * (-3) - (-4)*12 = -36 - (- 48)= -36 + 48= 12
3. 48* (-36) + (-36) * (-42)= -1728 + 1512= -216
4. 24*(-3)-4*(-3)= -72 -(-12)= -72 + 12= 60
5. (-16):4+(-24):4= -4 + (-6)= -4 - 6= 10
6. (-36):(-7)+15:(-7)= 5 1/7 + (-2 1/7)= 5 1/7 - 2 1/7= 3
7.14:(-3)-(-8):3= -4 2/3 - (-2 2/3)= -4 2/3 + 2 2/3= -2
8.(-19):(-2)+(-21):2= 9 1/2 + (-10 1/2)= 9 1/2 -10 1/2= -1