题目内容
计算
(1)5400-2940÷28×27
(2)(
+
)÷
+
(3)
×
+
÷4
(4)(
+
)×8+
(5)[2.5-(
+0.15)÷0.6]×
(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
(2)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
(3)
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
(4)(
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
(5)[2.5-(
| 17 |
| 20 |
| 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)(
+
)÷
+
=(
+
)÷
+
,
=
×
+
,
=
+
,
=
;
(3)
×
+
÷4
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)(
+
)×8+
=
×8+
×8+
,
=5+
+
,
=5+(
+
),
=5+1,
=6;
(5)[2.5-(
+0.15)÷0.6]×
=[2.5-(0.85+0.15)÷0.6]×
,
=[2.5-1÷0.6]×
,
=[2.5-
]
=2.5×
-
×
,
=1-
,
=
;
(6)
=
,
=100×99,
=9900.
=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 |
=
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 4 |
=(
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 4 |
=1×
| 1 |
| 4 |
=
| 1 |
| 4 |
(4)(
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=5+
| 8 |
| 27 |
| 19 |
| 27 |
=5+(
| 8 |
| 27 |
| 19 |
| 27 |
=5+1,
=6;
(5)[2.5-(
| 17 |
| 20 |
| 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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