题目内容

直接写出下列各题的得数,你是最快的!
2.1+3.4=
5.5
5.5
720-80=
640
640
2.6-1.7=
0.9
0.9
1.4-0.6=
0.8
0.8
0.3×40=
12
12
1.25×3×8=
30
30
3.8×0=
0
0
0.9+99×0.9=
90
90
7÷1.4=
5
5
390×0.02=
7.8
7.8
2.5+1.8=
4.3
4.3
6.5×4×0.2=
5.2
5.2
5
6
=
6
2
3
6
2
3
5
8
÷
3
8
=
1
2
3
1
2
3
44÷
11
10
=
40
40
4×(0.6+1.9)=
10
10
1
5
+
1
4
=
9
20
9
20
0.9-0.26=
0.64
0.64
14.5+9.5=
24
24
(0.18+0.9)÷9=
0.12
0.12
18÷36=
0.5
0.5
1.9×4×0.5=
3.8
3.8
7.2÷8×4=
3.6
3.6
78-0.8=
77.2
77.2
62-35=
27
27
20×5.5=
110
110
1.68+1.5=
3.18
3.18
3
4
×12=
9
9
8.3+1.7=
10
10
11.3-8.6=
2.7
2.7
2.4-0.5=
1.9
1.9
1
9
÷
2
3
=
1
6
1
6
3
2
+
1
2
=
2
2
3.25×4=
13
13
2
3
÷2=
1
3
1
3
6
7
÷3=
2
7
2
7
24×5=
120
120
0.77+0.33=
1.1
1.1
7
8
×
1
7
=
1
8
1
8
12.6÷3=
4.2
4.2
3.14×25=
78.5
78.5
3.14×36=
113.04
113.04
0.082=
0.0064
0.0064
8л=
25.12
25.12
1.4:
1.75
1.75
=
16
20
=
8
8
÷10=
80
80
%
分析:依据四则运算计算方法,以及比与分数,除式,百分数互化求解.
解答:
解:2.1+3.4=5.5; 720-80=640; 2.6-1.7=0.9; 1.4-0.6=0.8;
0.3×40=12; 1.25×3×8=30; 3.8×0=0; 0.9+99×0.9=90;
7÷1.4=5; 390×0.02=7.8; 2.5+1.8=4.3; 6.5×4×0.2=5.2;
5
6
=6
2
3
5
8
÷
3
8
=1
2
3
44÷
11
10
=40;
4×(0.6+1.9)=10;
1
5
+
1
4
=
9
20
0.9-0.26=0.64; 14.5+9.5=24; (0.18+0.9)÷9=0.12;
18÷36=0.5; 1.9×4×0.5=3.8; 7.2÷8×4=3.6; 78-0.8=77.2;
62-35=27; 20×5.5=110; 1.68+1.5=3.18;
3
4
×12=9;
8.3+1.7=10; 11.3-8.6=2.7; 2.4-0.5=1.9;
1
9
÷
2
3
=
1
6
3
2
+
1
2
=2;
3.25×4=13;
2
3
÷2=
1
3
6
7
÷3=
2
7
24×5=120; 0.77+0.33=1.1;
7
8
×
1
7
=
1
8
12.6÷3=4.2;
3.14×25=78.5; 3.14×36=113.04; 0.082=0.0064; 8л=25.12;
1.4:1.75=
16
20
=8÷10=80%.
故答案依次为:5.5,640,0.9,0.8,12,30,0,90,5,7.8,4.3,5.2,6
2
3
,1
2
3
,40,10,
9
20
0.64,24,0.12,0.5,3.8,3.6,77.2,27,110,3.18,9,10,2.7,1.9,
1
6
,2,13,
1
3
2
7
,120,1.1,
1
8
,4.2,78.5,113.04,0.0064,25.12,1.75,8,80,.
点评:本题主要考查学生四则运算计算能力.
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