一、口算。
20×5=
27+16=
107×5=
82+28=
414×2=
114×9=
84×4=
222+25=
800-80=
62-38=
65×3=
150+250=
28×5=
800×5=
420-240=
3×270=
64×7=
6×103=
74-47=
105×6=
497-23=
101+99=
210×2=
180×5=
20×5=
27+16=
107×5=
82+28=
414×2=
114×9=
84×4=
222+25=
800-80=
62-38=
65×3=
150+250=
28×5=
800×5=
420-240=
3×270=
64×7=
6×103=
74-47=
105×6=
497-23=
101+99=
210×2=
180×5=
答案
1.100
2.43
3.535
4.110
5.828
6.1026
7.336
8.247
9.720
10.24
11.195
12.400
13.140
14.4000
15.180
16.810
17.448
18.618
19.27
20.630
21.474
22.200
23.420
24.900
2.43
3.535
4.110
5.828
6.1026
7.336
8.247
9.720
10.24
11.195
12.400
13.140
14.4000
15.180
16.810
17.448
18.618
19.27
20.630
21.474
22.200
23.420
24.900
二、计算下面各题。
$24÷ 4× 617$
$27× (701 - 695)$
$(814 - 748)÷ 3$
$407× 2 - 125$
$206× (40÷ 8)$
$713 - (451 + 129)$
$24÷ 4× 617$
$27× (701 - 695)$
$(814 - 748)÷ 3$
$407× 2 - 125$
$206× (40÷ 8)$
$713 - (451 + 129)$
答案
1.3702
2.162
3.22
4.689
5.1030
6.133
2.162
3.22
4.689
5.1030
6.133
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