您好:
102x0.45
=100x0.45+2x0.45
=45+0.9
=45.9
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先拿100乘0.45就等于45 在拿2乘以0.45就等于0.9 拿0.9加45不久等于45.9
有两种简便算法:
102X0.45
=100X0.45+2X0.45
=45+0.9
=45.9
102X0.45
=102X5-102X0.5
=51-5.1
=45.9
102*0.45
=(100+2)*0.45
=100*0.45+2*0.45
=45+0.9
=45.9
102×0.45
=﹙100+2﹚×0.45
=100×0.45+2×0.45
=45+0.9
=45.9