简便方法运算,谢谢
2017-05-09
展开全部
99*384
=(100-1)384
=100*384-384
=38400-384=38016
1.25*2.5*8*2
=1.25*8*2.5*2
=10*5=50
12.3+4.08+3.7
=12.3+3.7+4.08
=16+4.08=20.08
=(100-1)384
=100*384-384
=38400-384=38016
1.25*2.5*8*2
=1.25*8*2.5*2
=10*5=50
12.3+4.08+3.7
=12.3+3.7+4.08
=16+4.08=20.08
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