问题 解答题 估算.3.5×9.9≈33÷7.9≈62.9÷7.01≈4.03×2.9≈ 答案 3.5×9.9≈3533÷7.9≈462.9÷7.01≈94.03×2.9≈12故答案为:35,4,9,12.