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1X2X3+2X4X6+3X6X9+4X8X12分之1X3X5+2X4X6+3X9X15+4X12X20用简便方法计算

题目详情
1X2X3+2X4X6+3X6X9+4X8X12分之1X3X5+2X4X6+3X9X15+4X12X20 用简便方法计算
▼优质解答
答案和解析
1X2X3+2X4X6+3X6X9+4X8X12/1X3X5+2X4X6+3X9X15+4X12X20 = 1X2X3(1+2+3+4)/1X3X5(1+3)+2X4X6(1+20) =1X2X3(1+2+3+4)/1X3X5X4+2X4X6X21 =1X2(1+2+3+4)/1X5X2X2+2X4X2X21 =10/10+168 =10/178 不知道对不?