Đáp án:
a)(-2).8.(-5)³.(-3)².(-5)
= (-2).8.(-125).9.(-5)
= (-125.8).[-2.(-5)].9
= -1 000.10.9
= -90 000.
b)(256-197)-(185+156-187)
= 256-197-185-156+187
= (256-156)-(197-187)-185
= 100-10-185
= 90-185
= -95.
c)18.13-3.6.10
= 18.13-18.10
= 18.(13-10)
= 18.3
= 54.
d)125.64+(-64).55+60.(-164)
= 64.(125-55)+60.(-164)
= 64.70+60.(-164)
= 60.(64-164)+64.10
= 60.(-100)+640
= -6000+640
= -5360.