a,(125+51)-(42+125+51-23)
=176-195
=-19
b,136.(-47)+36.47
=-11042+1692
=-9352
c,(-48).72+36.(-304)
=-3456+(-10944)
=-14400
a. (125+51)-(42+125+51-23)
= 125+51-42-125-51+23
= (125-125)+(51-51)+(-42-23)
=0+0+(-19)
=0+(-19)
b. 136.(-47)+36.47
=(-136).47+36.47
=[(-136)+36].47
=(-100).47
=-4700
c. (-48).72+36.(-304)
=(-3456)+(-10944)
=-14400