(1)4444×9999÷6666
=9×1111×4×1111÷(6×1111)
=36×1111×1111÷(6×1111)
=36÷6×(1111×1111÷1111)
=6×1111
=6666
(2)
×16-
×8+
×4-
×2
=
×(16-8+4-2)
=
×10
=
(3)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷(6÷7)÷(7÷8)
=1÷
÷
÷
÷
÷
÷
=1×
×
×
×
×
×
=4
(4)12345-(1234+2345)
=(10000+2000+300+40+5)-(1000+200+30+4+20000+300+30+5)
=10000+2000+300+40+5-1000-200-30-4-2000-300-30-5
=10000+(2000-2000)+(300-300)+(40-30)+(5-5)-1000-200-4-30
=10000-1000-200-30-4
=8766
(5)0.125×0.25×64×0.5
=0.125×0.25×8×8×0.5
=(0.125×8)×(0.25×8)×0.5
=1×2×0.5
=1
(6)2010×20092009-2009×20102010
=2010×2009×10001-2009×2010×10001
=0
(7)79999+7999+799+79+24
=(80000-1)+(8000-1)+(800-1)+(80-1)+24
=88880-4+24
=88880+20
=90000
(8)
=
=
=600
(9)10%÷20×30÷40%
=
÷20×30÷