下面各题怎样算简便就怎样算.①1.89+3.6+6.4+0.11②53-59×32-16③1.2×99+1.2④[34-(45-310)]×811.-数学

题目简介

下面各题怎样算简便就怎样算.①1.89+3.6+6.4+0.11②53-59×32-16③1.2×99+1.2④[34-(45-310)]×811.-数学

题目详情

下面各题怎样算简便就怎样算.
①1.89+3.6+6.4+0.11
5
3
-
5
9
×
3
2
-
1
6

③1.2×99+1.2
④[
3
4
-(
4
5
-
3
10
)]×
8
11
题型:解答题难度:中档来源:不详

答案

①1.89+3.6+6.4+0.11,
=(1.89+0.11)+(3.6+6.4),
=2+10,
=12;

class="stub"5
3
-class="stub"5
9
×class="stub"3
2
-class="stub"1
6

=class="stub"5
3
-class="stub"5
6
-class="stub"1
6

=class="stub"5
3
-(class="stub"5
6
+class="stub"1
6
),
=class="stub"5
3
-1,
=class="stub"2
3


③1.2×99+1.2,
=(99+1)×1.2,
=100×1.2,
=120;

④[class="stub"3
4
-(class="stub"4
5
-class="stub"3
10
)]×class="stub"8
11

=[class="stub"3
4
-(class="stub"8
10
-class="stub"3
10
)]×class="stub"8
11

=[class="stub"3
4
-class="stub"1
2
class="stub"8
11

=class="stub"1
4
×class="stub"8
11

=class="stub"2
11

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