Question

Tính nhanh :

a) \(\left(-4\right)\left(+125\right)\left(-25\right)\left(-6\right)\left(-8\right)\)

b) \(\left(-98\right)\left(1-246\right)-246.98\)

Answer 1

Sách Giáo Khoa

a) (-4).(+125).(-25).(-6).(-8) = [(-4).(-25)].[(+125).(-8)].(-6) = 100.(-1000).(-6) = 600000 b) (-98).(1 - 246) – 246.98 = -98 + 98.246 - 246.98 = -98 + 98.(246 - 246) = -98 + 98.0 = -98

Answer 2

a) (-4).(+125).(-25).(-6).(-8)

= [(-4).(-25)].[(+125).(-8)].(-6)

= 100.(-1000).(-6)

= 600000

b) (-98).(1 - 246) – 246.98

= -98 + 98.246 - 246.98

= -98 + 98.(246 - 246)

= -98 + 98.0

= -98

Answer 3

a)(-4).(+125).(-25).(-6).(-8)

=4 . 125 . 25. 6 . 8

=(4.25).(125.8).6

=100 . 1000.6

= 600000

b)(-98).(1-246)-246.98

= (-98)-(-245)-246.98

= 98. 245 -246.98

= 98.(245-246)

= 98.(-1)

= -98

Answer 4

a, (-4).(+125).(-25).(-6).(-8)

= [(-4).(-25)].[(-125).(-8) ]. (-6)

= 100.1000 . (-6)

= 100000. (-6)

= -600000

b, (-98).(1-246)-246.98

= (98-98). (246-246) .1

= 0.0-1

= -1

Answer 5

a, (-4).(+125).(-25).(-6).(-8)

= [(-4).(-25)].[(-125).(-8) ]. (-6)

= 100.1000 . (-6)

= 100000. (-6)

= -600000

b, (-98).(1-246)-246.98

= (98-98). (246-246) .1

= 0.0-1

= -1