计算下面各题:18+(78-512);413-2.5+134;23-19-29;〔16.8-(1.6+3.8)〕÷1.9;9.8×100.1;8.4÷3.5.-数学

题目简介

计算下面各题:18+(78-512);413-2.5+134;23-19-29;〔16.8-(1.6+3.8)〕÷1.9;9.8×100.1;8.4÷3.5.-数学

题目详情

计算下面各题:
1
8
+(
7
8
-
5
12
);
4
1
3
-2.5+1
3
4
2
3
-
1
9
-
2
9
〔16.8-(1.6+3.8)〕÷1.9;9.8×100.1;8.4÷3.5.
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
8
+(class="stub"7
8
-class="stub"5
12
),
=(class="stub"1
8
+class="stub"7
8
)-class="stub"5
12

=1-class="stub"5
12

=class="stub"7
12


(2)4class="stub"1
3
-2.5+1class="stub"3
4

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

=4class="stub"4
12
-2class="stub"6
12
+1class="stub"9
12

=3class="stub"7
12


(3)class="stub"2
3
-class="stub"1
9
-class="stub"2
9

=class="stub"2
3
-(class="stub"1
9
+class="stub"2
9
),
=class="stub"2
3
-class="stub"1
3

=class="stub"1
3


(4)[16.8-(1.6+3.8)]÷1.9,
=[16.8-5.4]÷1.9,
=11.4÷1.9,
=6;

(5)9.8×100.1,
=9.8×(100+0.1),
=980+0.98,
=980.98;

(6)8.4÷3.5=2.4.

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