神机妙算
(一)
用时分 答对题
$26+9=$
$42×2=$
$600÷3=$
$48÷6=$
$290-90=$
$303×3=$
$45+1000=$
$83-57=$
$9×400=$
$21×3=$
$41×2=$
$77-29=$
$405÷5=$
$5.6+1.4=$
$398÷8≈$
$999÷2≈$
$4200÷7÷6=$
$(15+25)×3=$
$300÷3×6=$
$57-38=$
$99÷3=$
$960÷3=$
$130×3=$
$900+100=$
$404×2=$
$35÷7=$
$640÷8=$
$690÷3=$
$5×46=$
$71-23=$
$0×48=$
$75÷5=$
$2.5+2.4=$
$801÷8≈$
$89×9≈$
$600÷3÷2=$
$(600-500)÷2=$
$70×4÷7=$
$1500-700=$
$770÷7=$
$0÷51=$
$600×7=$
$101×2=$
$105×4=$
$7×8+20=$
$70+500=$
$430×2=$
$32×3=$
$18×4=$
$720÷9=$
$804÷4=$
$7.5-3.6=$
$69×7≈$
$38×4≈$
$5×60÷3=$
$400÷(10-6)=$
$(512+430)×0=$

1.35
2.84
3.200
4.8
5.200
6.909
7.1045
8.26
9.3600
10.63
11.82
12.48
13.81
14.7.0
15.50
16.500
17.100
18.120
19.600
20.19
21.33
22.320
23.390
24.1000
25.808
26.5
27.80
28.230
29.230
30.48
31.0
32.15
33.4.9
34.100
35.810
36.100
37.50
38.40
39.800
40.110
41.0
42.4200
43.202
44.420
45.76
46.570
47.860
48.96
49.72
50.80
51.201
52.3.9
53.490
54.160
55.100
56.100
57.0