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98+198+1998+2×3简便算法?
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98+198+1998+2ⅹ3简便方法如下:
98+198+1998+2ⅹ3
=98+198+1998+6
=(98+2)+(198+2)+(1998+2)
=100+200+2000
=300+2000
=2300
98+198+1998+2ⅹ3
=98+198+1998+6
=(98+2)+(198+2)+(1998+2)
=100+200+2000
=300+2000
=2300
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