Question

怎么写，都是简便方法计算那九道题

• 你的回答被采纳后将获得：
• 系统奖励15（财富值+成长值）+难题奖励20（财富值+成长值）

Answer 1

648+203
=648+200+3
=848+3
=851
98x32

=100x32-2x32
=3200-64
=3136

36x15
=9x4x15
=9x60
=540

254+72+46
=(254+46)+72
=300+72
=372

138-37-63
=138-(37+63)
=138-100
=38

129-(29+57)
=129-29-57
=100-57
=43

43+43x99
=43x(1+99)
=43x100
=4300

48x101-48
=48x(101-1)
=48x100
=4800

57x69+69x43
=(57+43)x69
=100x69
=6900