题目内容

计算
(1)5400-2940÷28×27
(2)(
4
5
+
1
4
)÷
7
3
+
7
10

(3)
5
6
×
1
4
+
1
6
÷4
(4)(
5
8
+
1
27
)×8+
19
27

(5)[2.5-(
17
20
+0.15)÷0.6]×
2
5

(6)若!是一种数学运算符号,并且有1!=1,2!=2×1=2,3!=3×2×1=6,4!=4×3×2×1…则求98!分之100!的值?
(1)5400-2940÷28×27
=5400-105×27,
=5400-2835,
=2565;

(2)(
4
5
+
1
4
)÷
7
3
+
7
10

=(
16
20
+
5
20
÷
7
3
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
14
20

=
23
20


(3)
5
6
×
1
4
+
1
6
÷4
=
5
6
×
1
4
+
1
6
×
1
4

=(
5
6
+
1
6
)×
1
4

=1×
1
4

=
1
4


(4)(
5
8
+
1
27
)×8+
19
27

=
5
8
×
8+
1
27
×8+
19
27

=5+
8
27
+
19
27

=5+(
8
27
+
19
27
),
=5+1,
=6;

(5)[2.5-(
17
20
+0.15)÷0.6]×
2
5

=[2.5-(0.85+0.15)÷0.6]×
2
5

=[2.5-1÷0.6]×
2
5

=[2.5-
5
3
]
=2.5×
2
5
-
5
3
×
2
5

=1-
2
3

=
1
3


(6)
100!
98!

=
100×99×98…1
98×97×…×1

=100×99,
=9900.
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