这几道题的简便算法以及得数456-299,456+109,456-109,23+45+55+77,891-238-562,571-（271-48）,56.5-41.2+43.5-58.8,25×125×5×2×4×8,25×1.6,125×72,47×56+44×47,99×45,101×45,9.9×45+4.5,101×45-45,56×11 37×12+12×56+12×7,75×21+25×

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这几道题的简便算法以及得数456-299,456+109,456-109,23+45+55+77,891-238-562,571-（271-48）,56.5-41.2+43.5-58.8,25×125

这几道题的简便算法以及得数456-299,456+109,456-109,23+45+55+77,891-238-562,571-（271-48）,56.5-41.2+43.5-58.8,25×125×5×2×4×8,25×1.6,125×72,47×56+44×47,99×45,101×45,9.9×45+4.5,101×45-45,56×11 37×12+12×56+12×7,75×21+25×
这几道题的简便算法以及得数
456-299,456+109,456-109,23+45+55+77,891-238-562,571-（271-48）,56.5-41.2+43.5-58.8,25×125×5×2×4×8,25×1.6,125×72,47×56+44×47,99×45,101×45,9.9×45+4.5,101×45-45,56×11 37×12+12×56+12×7,75×21+25×37,120×（1/2+1/3+1/4）,25×1/3×3/5×3/10,2007×2005/2006,

66*11的简便算法简便算法和得数这几道题的简便算法以及得数456-299,456+109,456-109,23+45+55+77,891-238-562,571-（271-48）,56.5-41.2+43.5-58.8,25×125×5×2×4×8,25×1.6,125×72,47×56+44×47,99×45,101×45,9.9×45+4.5,101×45-45,56×11 37×12+12×56+12×7,75×21+25× 123+456的简便算法简便算法123+456 299+346的简便计算法 19+299+3999+4999的简便算法 59乘299的简便算法 456乘99的简便算法.急这道题最简便的算法? 最简便的算法简便算法的过程这道题的简便算法这道题的简便算法这道题的简便算法这道题的简便算法的简便算法 456+299 简便算法怎么简便怎么算小学简便算法题858÷13 的简便算法 1/2-(1-8/9)简便算法的简便算法