问题
解答题
|
答案
(1)23+99
=23+100-1
=123-1
=122;
(2)253-199
=253-200+1
=53+1
=54;
(3)25×7×4
=25×4×7
=100×7
=700;
(4)120÷6÷5
=120÷(6×5)
=120÷30
=4.
|
(1)23+99
=23+100-1
=123-1
=122;
(2)253-199
=253-200+1
=53+1
=54;
(3)25×7×4
=25×4×7
=100×7
=700;
(4)120÷6÷5
=120÷(6×5)
=120÷30
=4.