Bài 1:
a, 1532+(-186)+(-1432)-14+123
=1532-186-1432-14+123
=(1532-1432)-(186+14)+123
=100-200+123
=23
b,-47.69+32.(-47)-47
=47.(-69-32-1)
=47.(-102)
=-4794
c,34.(-84)+17.(-32)
=17.2.(-84)+17.(-32)
=17.(-84.2-32)
=17.(-200)
=-3400
d,87.(13-18)-13.(87+18)
=87.(13-13)-18.(87+13)
=87.0-18.100=0-1800=-1800