计算(1)349-(21117-259);(2)(23+79×928)÷1112;(3)123×[756÷(14.625-318)-413].-数学

题目简介

计算(1)349-(21117-259);(2)(23+79×928)÷1112;(3)123×[756÷(14.625-318)-413].-数学

题目详情

计算
(1)3
4
9
-(2
11
17
-2
5
9
);
(2)(
2
3
+
7
9
×
9
28
)÷
11
12

(3)1
2
3
×[7
5
6
÷(14.625-3
1
8
)-4
1
3
].
题型:解答题难度:中档来源:不详

答案

(1)3class="stub"4
9
-(2class="stub"11
17
-2class="stub"5
9

=3class="stub"4
9
+2class="stub"5
9
-2class="stub"11
17

=6-2class="stub"11
17

=3class="stub"6
17


(2)(class="stub"2
3
+class="stub"7
9
×class="stub"9
28
)÷class="stub"11
12

=(class="stub"2
3
+class="stub"1
4
)÷class="stub"11
12

=class="stub"11
12
×class="stub"12
11

=1;

(3)1class="stub"2
3
×[7class="stub"5
6
÷(14.625-3class="stub"1
8
)-4class="stub"1
3
]
=1class="stub"2
3
×[7class="stub"5
6
÷11.5-4class="stub"1
3
]
=1class="stub"2
3
×[class="stub"47
6
×class="stub"2
23
-4class="stub"1
3
]
=1class="stub"2
3
×[class="stub"47
69
-4class="stub"1
3
]
=class="stub"5
3
×(-class="stub"252
69

=-class="stub"140
23

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