问题
解答题
脱式计算.
(1)21×(230-192÷4)
(2)118+306÷17+265
(3)540÷45×(65+35)
(4)(119+181)÷(1000-975)
答案
(1)21×(230-192÷4)
=21×(230-48)
=21×182
=3822;
(2)118+306÷17+265
=118+18+265
=136+265
=401;
(3)540÷45×(65+35)
=540÷45×100
=12×100
=1200;
(4)(119+181)÷(1000-975)
=300÷25
=12.