用递等式计算,能简算的要简算.(1)2-511÷922-89(2)6÷[(35+110)×521](3)(41×9.9+4.1)(4)(512+19+38)×72(5)754-(302+459÷51)

题目简介

用递等式计算,能简算的要简算.(1)2-511÷922-89(2)6÷[(35+110)×521](3)(41×9.9+4.1)(4)(512+19+38)×72(5)754-(302+459÷51)

题目详情

用递等式计算,能简算的要简算.
(1)2-
5
11
÷
9
22
-
8
9
(2)6÷[(
3
5
+
1
10
)×
5
21
]
(3)(41×9.9+4.1)
(4)(
5
12
+
1
9
+
3
8
)×72
(5)754-(302+459÷51)(6)9×(
2
9
-
1
13
)×13.
题型:解答题难度:中档来源:不详

答案


(1)2-class="stub"5
11
÷class="stub"9
22
-class="stub"8
9

=2-class="stub"10
9
-class="stub"8
9

=2-(class="stub"10
9
+class="stub"8
9
),
=2-2,
=0;

(2)6÷[(class="stub"3
5
+class="stub"1
10
)×class="stub"5
21
],
=6÷[class="stub"7
10
×class="stub"5
21
],
=6÷class="stub"1
6

=36;

(3)41×9.9+4.1,
=4.1×99+4.1,
=4.1×(99+1),
=4.1×100,
=410;

(4)(class="stub"5
12
+class="stub"1
9
+class="stub"3
8
)×72

=class="stub"5
12
×72+class="stub"1
9
×72+class="stub"3
8
×72,
=30+8+27,
=38+27,
=65;

(5)754-(302+459÷51),
=754-(302+9),
=754-311,
=443;

(6)9×(class="stub"2
9
-class="stub"1
13
)×13,
=9×class="stub"2
9
×13-9×class="stub"1
13
×13,
=26-9,
=17.

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