一、口算。
$42÷7=$
$46-8=$
$3×2×7=$
$4×4=$
$24÷6=$
$77-30-9=$
$25÷5=$
$9×7=$
$5×8+7=$
$37-30=$
$36÷4=$
$6×3÷9=$
$26+9=$
$200+80=$
$17+20+7=$
$48÷8=$
$7×5=$
$7×7+7=$
$9×5=$
$6×4=$
$72÷9+18=$
$8×4=$
$54÷9=$
$17+30+8=$
$21÷7=$
$550-50=$
$32÷8÷4=$
$13+20=$
$7×4=$
$6×6-20=$
$42÷7=$
$46-8=$
$3×2×7=$
$4×4=$
$24÷6=$
$77-30-9=$
$25÷5=$
$9×7=$
$5×8+7=$
$37-30=$
$36÷4=$
$6×3÷9=$
$26+9=$
$200+80=$
$17+20+7=$
$48÷8=$
$7×5=$
$7×7+7=$
$9×5=$
$6×4=$
$72÷9+18=$
$8×4=$
$54÷9=$
$17+30+8=$
$21÷7=$
$550-50=$
$32÷8÷4=$
$13+20=$
$7×4=$
$6×6-20=$
答案
1.6
2.38
3.42
4.16
5.4
6.38
7.5
8.63
9.47
10.7
11.9
12.2
13.35
14.280
15.44
16.6
17.35
18.56
19.45
20.24
21.26
22.32
23.6
24.55
25.3
26.500
27.1
28.33
29.28
30.16
2.38
3.42
4.16
5.4
6.38
7.5
8.63
9.47
10.7
11.9
12.2
13.35
14.280
15.44
16.6
17.35
18.56
19.45
20.24
21.26
22.32
23.6
24.55
25.3
26.500
27.1
28.33
29.28
30.16
二、在()里填合适的数。
400 +(
260 -(
(
(
50 +(
70 +(
(
780 -(
620 -(
540 -(
(
(
(
80 +(
690 -(
400 +(
50
)= 450260 -(
200
)= 60(
330
)- 30 = 300(
210
)- 10 = 20050 +(
300
)= 35070 +(
600
)= 670(
600
)+ 300 = 900780 -(
80
)= 700620 -(
600
)= 20540 -(
500
)= 40(
40
)+ 800 = 840(
500
)+ 90 = 590(
320
)- 20 = 30080 +(
500
)= 580690 -(
600
)= 90答案
1.50
2.200
3.330
4.210
5.300
6.600
7.600
8.80
9.600
10.500
11.40
12.500
13.320
14.500
15.600
2.200
3.330
4.210
5.300
6.600
7.600
8.80
9.600
10.500
11.40
12.500
13.320
14.500
15.600
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