问题 解答题 估一估.11×8≈38×6≈58×7≈82×3≈289×4≈602×6≈509×8≈511×4≈ 答案 11×8≈80,38×6≈240,58×7≈420,82×3≈240,289×4≈1200,602×6≈3600,509×8≈4000,511×4≈2000.故答案为:80,240,420,240,1200,3600,4000,2000.