- 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
- 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