问题
解答题
在○里填运算符号,在□中填数.
(1)465-199
=465-200○□
=□○□
=□
(2)99×33
=(100○□)×33
=100×33○□×33
=□
(3)125×56
=125×(□×□)
=125×□×□
=□
(4)3000÷4÷25
=3000÷(□○□)
=3000÷□
=□
答案
(1)465-199
=465-200+1
=265+1,
=266;
(2)99×33
=(100-1)×33,
=100×33-1×33,
=3277;
(3)125×56
=125×(8×7)
=125×8×7,
=7000;
(4)3000÷4÷25
=3000÷(4×25),
=3000÷100,
=30.
故答案为:+,1,265+1,266;-,1,-1,3277;8×7,8,7,7000;4×25,100,30.