问题 解答题 估算:52×68≈89×30≈25×31≈604÷3≈122÷3≈302÷6≈ 答案 52×68≈350089×30≈270025×31≈750604÷3≈200122÷3≈40302÷6≈50故答案为:3500,2700,750,200,40,50.