问题
解答题
脱式计算.
28×25-240
125+18×23.
答案
(1)28×25-240,
=7×4×25-240,
=7×(4×25)-240,
=7×100-240,
=700-240,
=460;
(2)125+18×23,
=125+414,
=539.
脱式计算.
28×25-240
125+18×23.
(1)28×25-240,
=7×4×25-240,
=7×(4×25)-240,
=7×100-240,
=700-240,
=460;
(2)125+18×23,
=125+414,
=539.