计算(1)5400-2940÷28×27(2)(45+14)÷73+710(3)56×14+16÷4(4)(58+127)×8+1927(5)[2.5-(1720+0.15)÷0.6]×25(6)若!

题目简介

计算(1)5400-2940÷28×27(2)(45+14)÷73+710(3)56×14+16÷4(4)(58+127)×8+1927(5)[2.5-(1720+0.15)÷0.6]×25(6)若!

题目详情

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?
题型:解答题难度:中档来源:不详

答案

(1)5400-2940÷28×27
=5400-105×27,
=5400-2835,
=2565;

(2)(class="stub"4
5
+class="stub"1
4
)÷class="stub"7
3
+class="stub"7
10

=(class="stub"16
20
+class="stub"5
20
÷class="stub"7
3
+class="stub"7
10

=class="stub"21
20
×class="stub"3
7
+class="stub"7
10

=class="stub"9
20
+class="stub"14
20

=class="stub"23
20


(3)class="stub"5
6
×class="stub"1
4
+class="stub"1
6
÷4
=class="stub"5
6
×class="stub"1
4
+class="stub"1
6
×class="stub"1
4

=(class="stub"5
6
+class="stub"1
6
)×class="stub"1
4

=1×class="stub"1
4

=class="stub"1
4


(4)(class="stub"5
8
+class="stub"1
27
)×8+class="stub"19
27

=class="stub"5
8
×
8+class="stub"1
27
×8+class="stub"19
27

=5+class="stub"8
27
+class="stub"19
27

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

(5)[2.5-(class="stub"17
20
+0.15)÷0.6]×class="stub"2
5

=[2.5-(0.85+0.15)÷0.6]×class="stub"2
5

=[2.5-1÷0.6]×class="stub"2
5

=[2.5-class="stub"5
3
]
=2.5×class="stub"2
5
-class="stub"5
3
×class="stub"2
5

=1-class="stub"2
3

=class="stub"1
3


(6)class="stub"100!
98!

=class="stub"100×99×98…1
98×97×…×1

=100×99,
=9900.

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