Question

Bài 5: Tính nhanh: a) 32.(-64)– 64.68 b) –54.76+46.(-76) c) 75.18+18. 25 d) (-4).(+3).(-125).(=25).(-8)

Answer 1

a, 32.(-64) - 64.68

   = -64( 32 + 68)

= -64 .100

= - 6400

b, -54.76 + 46.(-76)

= -76.(54 + 46)

= - 76. 100

= - 7600

c, 75.18 + 18.25

= 18.(75 + 25)

= 18 . 100

= 1800

 

Answer 2

d,  (-4).(3).(-125)(-25).(-8)

=   3.(-4. (-25).((-125).(-8)

= 3.100.1000

= 300000