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7/3乘以2/21乘以7/9乘以3/5除以(1/7+2/7)算试

7/3乘以2/21乘以7/9乘以3/5除以(1/7+2/7) =2/9x7/9x3/5÷3/7 =14/81x3/5x7/3 =14/135x7/3 =98/405

7X3=21读作:三乘以七等于二十一。(×) 按照”被乘数、乘数、积“的顺序读。七乘以三等于二十一。

11 直接乘 十四分之一 九分之二 分开成就化简了 六分只五 你把题目/五分之六化成六分之五 提取公共的六分之五 4又4/5 70/11

=21*1/7+21*2/3 =3+14 =17

46×7/45 =(45+1)*7/45 =7+7/45 =7又45分之7 2/3×5/4除以10/9 =10/12*9/10 =3/4 24×2/7×5/72×21 =24*5/72*2/7*21 =5/3*6/7 =10/7 8/13除以7+1/7×6/13 =8/13*1/7+1/7*6/13 =2/13*7(4+3) =2/13

5-3/2x10/21-2x1/7 =5-5/7-2/7 =5-(5/7+2/7) =5-1 =4

1×2×3+3×6×9+7×14×21/1×3×5+3×9×5+7×21×35 =1×2×3+3×1×2×3+7×1×2×3/1×3×5+3×1×3×5+7×1×3×5 =1×2×3/1×3×5 =2/5

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