(-30)-567+30-27=(-30+30)+(-567-27)=-594
70+[12-170+(-12)=70+12-170-12=(70-170)+(12-12)=-100
(-110)-(2345-110)=-110-2345+110=(-110+110)-2345=-2345
2.4.25.(-5).7=(-5.2).(4.25).7=-10.100.7=-7000
(-15).7+93.(-15)=-15.(7+93)=-15.100=-1500
(-8).23+77.(-8)=-8.(23+77)=-8.100=-800
Chuc ban hoc tot !!!