问题 解答题 估算:80÷19≈92÷30≈400÷49≈632÷90≈633÷88≈350÷68≈242÷60≈240÷81≈ 答案 80÷19≈4,92÷30≈3,400÷49≈8,632÷90≈7,633÷88≈7,350÷68≈5,242÷60≈4,240÷81≈3.