试题详情
直接写得数。
230 + 350= 206×3 = 160+340 = 570－290 =
=
=
+
= 999 ×1 =
202× 9 ≈ 598－153 ≈ 390 × 5 ≈ 117 × 4 ≈
知识点
参考答案
采纳过本试题的试卷
230 + 350= 206×3 = 160+340 = 570－290 =
=
=
+
= 999 ×1 =
202× 9 ≈ 598－153 ≈ 390 × 5 ≈ 117 × 4 ≈