a,(-5).6.(-2).7 b,123-(-77)-12 .(-4)+31 c, 3.(-3)^3+(-4).12-34 d,(37-17).(-5)+(-13-17)
=[(-5).(-2)].7 =123+77+48+31 =3.(-27)+(-48)-34 =20.(-5)+(-20)
=10.7 =(123+77)+(48+31) =(-81)+(-48)-34 =20.(-5)-20.1
=70 =200+79 =-163 =20.(-5-1)
=279 =20.(-6)
=-120
e,34.(-27)+27.134 g,24.36-(-24).64
=(-34).27+27.134 =24.36+24.64
=27.(-34+134) =24.(36+64)
=27.100 =24.100
=2700 =2400