计算下列各题能简算的要简算.3.45×6.8+65.5×0.68[6+(67-13)×711]÷95%99×2004-98×20051-110-1100-11000-…-11000000000012+

题目简介

计算下列各题能简算的要简算.3.45×6.8+65.5×0.68[6+(67-13)×711]÷95%99×2004-98×20051-110-1100-11000-…-11000000000012+

题目详情

计算下列各题能简算的要简算.
3.45×6.8+65.5×0.68[6+(
6
7
-
1
3
)×
7
11
]÷95%
99×2004-98×2005
1-
1
10
-
1
100
-
1
1000
-…-
1
10000000000
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+
1
42
题型:解答题难度:中档来源:不详

答案


(1)3.45×6.8+65.5×0.68,
=3.45×6.8+6.55×6.8,
=(3.45+6.55)×6.8,
=10×6.8,
=68;

(2)[6+(class="stub"6
7
-class="stub"1
3
)×class="stub"7
11
]÷95%,
=[6+class="stub"11
21
×class="stub"7
11
]÷95%,
=[6+class="stub"1
3
]÷95%,
=6class="stub"1
3
÷95%,
=class="stub"20
3


(3)99×2004-98×2005,
=99×(2005-1)-98×2005,
=99×2005-99-98×2005,
=99×2005-98×2005-99,
=(99-98)×2005-99,
=2005-99,
=1906;

(4)1-class="stub"1
10
-class="stub"1
100
-class="stub"1
1000
-…-class="stub"1
10000000000

=1-(class="stub"1
10
+class="stub"1
100
+class="stub"1
1000
+…+class="stub"1
10000000000
),
=1-(0.1+0.01+0.01+…+0.0000000001),
=1-0.1111111111,
=0.8888888889;

(5)class="stub"1
2
+class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30
+class="stub"1
42

=class="stub"1
1×2
+class="stub"1
2×3
+class="stub"1
3×4
+class="stub"1
4×5
+class="stub"1
5×6
+class="stub"1
6×7

=1-class="stub"1
2
+class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+class="stub"1
4
-class="stub"1
5
+class="stub"1
5
-class="stub"1
6
+class="stub"1
6
-class="stub"1
7

=1-class="stub"1
7

=class="stub"6
7

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