(1)8.25+[2.85-(325-10.8×29)÷1114](2)14×(4.85÷518-3.6+6.15×335)+[5.5-1.75×(123+1921)](3)1+2+3+4+…+99+

题目简介

(1)8.25+[2.85-(325-10.8×29)÷1114](2)14×(4.85÷518-3.6+6.15×335)+[5.5-1.75×(123+1921)](3)1+2+3+4+…+99+

题目详情

(1)8.25+[2.85-(3
2
5
-10.8×
2
9
)÷1
1
14
]
(2)
1
4
×(4.85÷
5
18
-3.6+6.15×3
3
5
)+[5.5-1.75×(1
2
3
+
19
21
)]
(3)1+2+3+4+…+99+100+99+…+4+3+2+1.
题型:解答题难度:中档来源:不详

答案

(1)8.25+[2.85-(3class="stub"2
5
-10.8×class="stub"2
9
)÷1class="stub"1
14
]
=class="stub"33
8
+[class="stub"57
20
-(class="stub"17
5
-
class="stub"54
5
×class="stub"2
9
)×class="stub"14
15
],
=class="stub"33
8
+[class="stub"57
20
-(class="stub"17
5
-class="stub"12
5
)×class="stub"14
15
],
=class="stub"33
8
+[class="stub"57
20
-class="stub"14
15
],
=class="stub"33
8
+class="stub"23
12

=class="stub"145
24


(2)class="stub"1
4
×(4.85÷class="stub"5
18
-3.6+6.15×3class="stub"3
5
)+[5.5-1.75×(1class="stub"2
3
+class="stub"19
21
)]
=class="stub"1
4
×(class="stub"97
20
×class="stub"18
5
-class="stub"18
5
+class="stub"123
20
×class="stub"18
5
)+[class="stub"11
2
-class="stub"7
4
×
class="stub"5
3
+class="stub"19
21
)],
=class="stub"1
4
×
[(class="stub"97
20
+class="stub"123
20
-1
)×class="stub"18
5
]+[class="stub"11
2
-class="stub"7
4
×class="stub"54
21
],
=class="stub"1
4
×[10×class="stub"18
5
]+[class="stub"11
2
-class="stub"27
6
],
=class="stub"1
4
×36+1,
=10.
(3)1+2+3+4+…+99+100+99+…+4+3+2+1
=[(1+100)×100÷2]+[(99+1)×99÷2],
=5050+4950,
=10000.

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