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6.5乘以2.3加上6.5乘以6.7加上6.5的简便计算方法是...

原式 =6.5x2.3+6.5x6.7+6.5 =6.5x(2.3+6.7+1) =6.5x(9+1) =6.5x10 =65

6.5x3.7-2.5x3.7+3.7 =(6.5-2.5+1)x3.7 =5x3.7 =18.5

6.5X2.3+6.7X6.5 =6.5X(2.3+6.7) =6.5X9 =58.5

5.5乘以17.3加6.7乘以5.5简便计算 =5.5x(17.3+6.7) =5.5x24 =(5+0.5)x24 =5x24+0.5x24 =120+12 =132

7分之5x6+7分之5 =7分之5x(6+1) =7分之5x7 =5 有不明白的可以追问!谢谢!! 祝学习进步!

2/7×6×5/6 =2/7×(6×5/6) =2/7×5 =10/7

5/6×5/16+5/6×7/16 =5/6×(5/16+7/16)(运用乘法分配律的逆运算,提取相同数字5/6) =5/6×12/16(分子和分母同时除以4,进行约分) =5/6×3/4(分子乘分子,分母乘分母) =5/8 解析:此题运用乘法分配律的逆运算,先提取先提取相同数字5/6,然后...

5.2+6.7-5.2+6.7 =(5.2-5.2)+(6.7+6.7) =13.4

7/8 + 6/7 + 5/6 + 4/5 +3/4 + 2/3 + 1/2 = 1-1/8 + 1-1/7 + 1-1/6 + 1-1/5 + 1-1/4 + 1-1/3 + 1-1/2 =7-(1/2 + 1/3 + 1/4 + 1/5 + 1/6 + 1/7 + 1/8) =7-(1/2 + 1/3 + 1/6 + 1/5 + 1/4 + 1/7 + 1/8) =7-(5/6+ 1/6 + 1/5 + 1/4 + 1/7 + 1/8) =7-(...

某数加上3,乘以7,再减去6,最后除以5等于10 [7(x+3)-6]/5=10 7(x+3)-6 =50 7x+21=65 7x=44 x=44/7

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