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直接写得数.300×5=103×3=510×5=115×0=309+481≈397×3≈510×7≈42×2=34+14=25-15=28+58=1-37=530+270=380-60=204×7=2600×2=

题目详情
直接写得数.
300×5=103×3=510×5=115×0=
309+481≈397×3≈510×7≈42×2=
3
4
+
1
4
=
2
5
-
1
5
=
2
8
+
5
8
=
1-
3
7
=
530+270=380-60=204×7=2600×2=
直接写得数.
300×5=103×3=510×5=115×0=
309+481≈397×3≈510×7≈42×2=
3
4
+
1
4
=
2
5
-
1
5
=
2
8
+
5
8
=
1-
3
7
=
530+270=380-60=204×7=2600×2=

300×5=103×3=510×5=115×0=
309+481≈397×3≈510×7≈42×2=
3
4
+
1
4
=
2
5
-
1
5
=
2
8
+
5
8
=
1-
3
7
=
530+270=380-60=204×7=2600×2=
300×5=103×3=510×5=115×0=309+481≈397×3≈510×7≈42×2=
3
4
+
1
4
=
2
5
-
1
5
=
2
8
+
5
8
=
1-
3
7
=
530+270=380-60=204×7=2600×2=300×5=103×3=510×5=115×0=300×5=103×3=510×5=115×0=309+481≈397×3≈510×7≈42×2=309+481≈397×3≈510×7≈42×2=
3
4
+
1
4
=
2
5
-
1
5
=
2
8
+
5
8
=
1-
3
7
=
3
4
+
1
4
=
3
4
+
1
4
=
3
4
343344
1
4
=
1
4
141144
2
5
-
1
5
=
2
5
-
1
5
=
2
5
252255
1
5
=
1
5
151155
2
8
+
5
8
=
2
8
+
5
8
=
2
8
282288
5
8
=
5
8
5855881-
3
7
=
3
7
=
3
7
373377530+270=380-60=204×7=2600×2=530+270=380-60=204×7=2600×2=
▼优质解答
答案和解析
300×5=1500103×3=309510×5=2550115×0=0
309+481≈800397×3≈1200510×7≈350042×2=84
3
4
+
1
4
=1
2
5
-
1
5
=
1
5
2
8
+
5
8
=
7
8
1-
3
7
=
4
7
530+270=800380-60=320204×7=14282600×2=5200
300×5=1500103×3=309510×5=2550115×0=0309+481≈800397×3≈1200510×7≈350042×2=84
3
4
+
1
4
=1
2
5
-
1
5
=
1
5
2
8
+
5
8
=
7
8
1-
3
7
=
4
7
530+270=800380-60=320204×7=14282600×2=5200 300×5=1500103×3=309510×5=2550115×0=0 300×5=1500 300×5=1500103×3=309103×3=309510×5=2550510×5=2550115×0=0115×0=0309+481≈800397×3≈1200510×7≈350042×2=84309+481≈800309+481≈800397×3≈1200397×3≈1200510×7≈3500510×7≈350042×2=8442×2=84
3
4
+
1
4
=1
2
5
-
1
5
=
1
5
2
8
+
5
8
=
7
8
1-
3
7
=
4
7
3
4
+
1
4
=1
3
4
+
1
4
=1
3
4
34333444+
1
4
=1
1
4
14111444=1
2
5
-
1
5
=
1
5
2
5
-
1
5
=
1
5
2
5
25222555-
1
5
=
1
5
1
5
15111555=
1
5
1
5
15111555
2
8
+
5
8
=
7
8
2
8
+
5
8
=
7
8
2
8
28222888+
5
8
=
7
8
5
8
58555888=
7
8
7
8
787778881-
3
7
=
4
7
1-
3
7
=
4
7
3
7
37333777=
4
7
4
7
47444777530+270=800380-60=320204×7=14282600×2=5200530+270=800530+270=800380-60=320380-60=320204×7=1428204×7=14282600×2=52002600×2=5200