问题
解答题
简便运算.(写出过程)
47+56+53+34865-245-155.
答案
(1)47+56+53+34
=47+53+56+34,
=(47+53)+(56+34),
=100+90,
=190;
(2)865-245-155
=865-(245+155),
=865-400,
=465.
简便运算.(写出过程)
47+56+53+34865-245-155.
(1)47+56+53+34
=47+53+56+34,
=(47+53)+(56+34),
=100+90,
=190;
(2)865-245-155
=865-(245+155),
=865-400,
=465.