问题
解答题
用简便方法计算.(写出主要过程)
|
答案
(1)6.3+7.28+3.7,
=7.28+(6.3+3.7),
=7.28+10,
=17.28;
(2)102×45,
=(100+2)×45,
=100×45+2×45,
=4500+90,
=4590.
用简便方法计算.(写出主要过程)
|
(1)6.3+7.28+3.7,
=7.28+(6.3+3.7),
=7.28+10,
=17.28;
(2)102×45,
=(100+2)×45,
=100×45+2×45,
=4500+90,
=4590.