试算出下列各式之值:4444×9999÷6666=120×16-120×8+120×4-120×2=1÷(2÷3)÷(3÷4)÷(4÷5)

试算出下列各式之值:4444×9999÷6666=120×16-120×8+120×4-120×2=1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷(6÷7)÷(7÷8)=12345-(1234+2345)=0.125×0.25×64×0.5=2010×20092009-2009×20102010=79999+7999+799+79+24=45×1251?(34+112)=10%÷20×30÷40%=11?1θ=3,θ=

第1个回答  2014-10-18
(1)4444×9999÷6666
=9×1111×4×1111÷(6×1111)
=36×1111×1111÷(6×1111)
=36÷6×(1111×1111÷1111)
=6×1111
=6666

(2)
1
20
×16-
1
20
×8+
1
20
×4-
1
20
×2
=
1
20
×(16-8+4-2)
=
1
20
×10
=
1
2


(3)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷(6÷7)÷(7÷8)
=1÷
2
3
÷
3
4
÷
4
5
÷
5
6
÷
6
7
÷
7
8

=1×
3
2
×
4
3
×
5
4
×
6
5
×
7
6
×
8
7

=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)
4
5
×125
1?(
3
4
+
1
12
)

=
100
1?
5
6

=
100
1
6

=600

(9)10%÷20×30÷40%
=
1
10
÷20×30÷
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