怎样算简便就怎样算.1.28+9.8+7.72+10.212×1120+12×204913÷(23-25)×3578×[67-(121+37)](80-9.8)×0.6-2.1(13-15)×45.-

题目简介

怎样算简便就怎样算.1.28+9.8+7.72+10.212×1120+12×204913÷(23-25)×3578×[67-(121+37)](80-9.8)×0.6-2.1(13-15)×45.-

题目详情

怎样算简便就怎样算.
1.28+9.8+7.72+10.2    
1
2
×
11
20
+
1
2
×
20
49
1
3
÷(
2
3
-
2
5
)×
3
5
7
8
×[
6
7
-(
1
21
+
3
7
)]
(80-9.8)×0.6-2.1
1
3
-
1
5
)×45.
题型:解答题难度:中档来源:不详

答案

(1)1.28+9.8+7.72+10.2,
=(1.28+7.72)+(9.8+10.2),
=9+20,
=29;

(2)class="stub"1
2
×class="stub"11
20
+class="stub"1
2
×class="stub"20
49

=class="stub"1
2
×(class="stub"11
20
+class="stub"20
49
),
=class="stub"1
2
×class="stub"939
980

=class="stub"939
1960


(3)class="stub"1
3
÷(class="stub"2
3
-class="stub"2
5
)×class="stub"3
5

=class="stub"1
3
÷class="stub"4
15
×class="stub"3
5

=class="stub"1
3
×class="stub"15
4
×class="stub"3
5

=class="stub"5
4
×class="stub"3
5

=class="stub"3
4


(4)class="stub"7
8
×[class="stub"6
7
-(class="stub"1
21
+class="stub"3
7
)],
=class="stub"7
8
×[class="stub"6
7
-class="stub"10
21
],
=class="stub"7
8
×class="stub"8
21

=class="stub"1
3


(5)(80-9.8)×0.6-2.1,
=70.2×0.6-2.1,
=42.12-2.1,
=40.02;

(6)(class="stub"1
3
-class="stub"1
5
)×45,
=class="stub"1
3
×45-class="stub"1
5
×45,
=15-9,
=6.

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