问题 解答题 (估算)49×104≈______×______=______(估算)98÷51≈______÷______=______估算过程:49≈______;104≈______估算过程:98≈______;51≈______. 答案 (1)49×104,≈50×100,=5000;(2)98÷51,≈100÷50,=2.故答案为:50,100,5000,100,50,2,50,100,100,50.