问题 解答题
直接写出得数.
400×5=0×39=32÷4=
4
9
-
1
9
=
405×2≈
72÷8=12×3=420+170=
2
5
+
1
5
=
89×7≈
90-43=80÷9=3000×2=1-
1
9
=
392×5≈
68÷7=21×5=61-16=
5
7
+
2
7
=
58×6≈
答案

400×5=2000,0×39=0,32÷4=8,
4
9
-
1
9
=
1
3
405×2≈800,
72÷8=9,12×3=36,420+170=590,
2
5
+
1
5
=
3
5
89×7≈630,
90-43=47,80÷9=8…8,3000×2=6000,1-
1
9
=
8
9
392×5≈2000,
68÷7=9…5,21×5=105,61-16=45,
5
7
+
2
7
=1,
58×6≈360.

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