Bài 1
a) \(A=\left(-13\right)+\left(-27\right)+\left(-65\right)=-13-27-65=-105\)
b) \(B=\left(-9\right)+\left(-14\right)+\left(-27\right)=-9-14-27=-50\)
c) \(C=\left|-7+11\right|+\left|-11+7\right|+\left|-11+\left(-7\right)\right|=4+4+18=26\)
d) \(D=\left[\left(-21\right)+\left(-34\right)\right]+\left[-21+34\right]+\left(-34+21\right)=-55+13-13=-55\)