能简算的要简算.(1)1880×201.1-187.9×2011;(2)89×[34-(716-25%)];(3)5.6×13.1+73.8×2.8;(4)7712-(125+2712)-2.6;(5

题目简介

能简算的要简算.(1)1880×201.1-187.9×2011;(2)89×[34-(716-25%)];(3)5.6×13.1+73.8×2.8;(4)7712-(125+2712)-2.6;(5

题目详情

能简算的要简算.
(1)1880×201.1-187.9×2011;
(2)
8
9
×[
3
4
-(
7
16
-25%)]

(3)5.6×13.1+73.8×2.8;
(4)7712-(125+2712)-2.6;
(5)0.25×0.32×125;
(6)
4
1×5
+
4
5×9
+
4
9×13
+
4
13×17
+
4
17×21
题型:解答题难度:中档来源:不详

答案

(1)1880×201.1-187.9×2011
=188×2011-187.9×2011
=(188-187.9×)2011
=0.1×2011
=201.1;

(2)class="stub"8
9
×[class="stub"3
4
-(class="stub"7
16
-25%)]

=class="stub"8
9
×[class="stub"3
4
-class="stub"7
16
+class="stub"1
4
]
=class="stub"8
9
×class="stub"9
16

=class="stub"1
2


(3)5.6×13.1+73.8×2.8
=2.8×26.2+73.8×2.8
=(26.2+73.8)×2.8
=100×2.8
=280;

(4)7712-(125+2712)-2.6
=7712-2712-125-2.6
=5000-125-2.6
=4875-2.6
=4872.4;

(5)0.25×0.32×125
=(0.25×4)×(0.08×125)
=1×10
=10;

(6)class="stub"4
1×5
+class="stub"4
5×9
+class="stub"4
9×13
+class="stub"4
13×17
+class="stub"4
17×21

=1-class="stub"1
5
+class="stub"1
5
-class="stub"1
9
+class="stub"1
9
-class="stub"1
13
+class="stub"1
13
-class="stub"1
17
+class="stub"1
17
-class="stub"1
21

=1-class="stub"1
21

=class="stub"20
21

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