下面各题怎样简便就怎样算.4849×5051.4-8.56-1.44108-1800÷45[1-(12-14)]×230.4×80×2.5×0.125(1115-95÷3)÷715.-数学

题目简介

下面各题怎样简便就怎样算.4849×5051.4-8.56-1.44108-1800÷45[1-(12-14)]×230.4×80×2.5×0.125(1115-95÷3)÷715.-数学

题目详情

下面各题怎样简便就怎样算.
48
49
×50
51.4-8.56-1.44108-1800÷45
[1-(
1
2
-
1
4
)]×
2
3
0.4×80×2.5×0.125
11
15
-
9
5
÷3)÷
7
15
题型:解答题难度:中档来源:不详

答案

(1)class="stub"48
49
×50

=class="stub"48
49
×(49+1),
=48+class="stub"48
49

=4848class="stub"48
49


(2)51.4-8.56-1.44,
=51.4-(8.56+1.44),
=51.4-10,
=41.4;

(3)108-1800÷45,
=108-40,
=68;

(4)[1-(class="stub"1
2
-class="stub"1
4
)]×class="stub"2
3

=[1-class="stub"1
4
class="stub"2
3

=class="stub"3
4
×class="stub"2
3

=class="stub"1
2


(5)0.4×80×2.5×0.125,
=(0.4×2.5)×(80×0.125),
=1×10,
=10;

(6)(class="stub"11
15
-class="stub"9
5
÷3)÷class="stub"7
15

=(class="stub"11
15
-class="stub"3
5
)×class="stub"15
7

=class="stub"2
15
×class="stub"15
7

=class="stub"2
7

更多内容推荐