分类：教育/科学-学习帮助
问题：用巧妙的方法计算（1）4X(63X25+25X37)(2)98X 
（1）4X(63X25+25X37)
(2)98X286+286X4-286X2
(3)(601+24-9)X8
(4)103X97

回答：4X(63X25+25X37) 
=4X[25X(63+37)]
=4X[25X100]
=10000

98X286+286X4-286X2 
=286X(98+4-2)
=28600

103X97
=100X97+3X97
=9700+291
=9991

(601+24-9)X8
=601X8+ (24-9)X8
=4808+120
=4928