簡便方法計算17x7x5,簡便方法計算1517x7x

2021-03-19 18:24:05 字數 1442 閱讀 8271

1樓:匿名使用者

簡便方法計算 (1/5+1/7)x7x5

(1/5+1/7)x7x5

=1/5*7*5+1/7*7*5

=7+5=12

2樓:匿名使用者

(1/5+1/7)x7x5

=1/5x7x5+1/7x7x5

=1/5x5x7+5

=7+5=12

(1/5+2/7)x5x7=(簡便計算)

3樓:逍遙九少

=1/5x5x7+2/7x5x7

=7+10

=17你好!如果我的回答對你有幫助,請採納,謝謝。

也歡迎繼續追問。

4樓:夢橙

1/5×5+2/7×7

7/12x1/5+5/12x7/5 (1/5+1/7)x5x7 (用簡便方法計算) 幫幫忙,今晚作業明天交不了,明天要挨批了

5樓:匿名使用者

7/12x1/5+5/12x7/5

=7/12×1/5+7/12×5/5

=7/12×(1/5+1)

=7/12×6/5

=7/10

(1/5+1/7)x5x7

=5×7×1/5+5×7×1/7

=7+5=12

6樓:明明和苗苗

7/12x1/5+5/12x7/5 (1/5+1/7)x5x7

=7/12x1/5+7/12x5/5+7+5

=12.7

簡便計算1/5+7分之三的和乘7×5等於多少

7樓:匿名使用者

(1/5+3/7)x7x5

=1/5x7x5+3/7x7x5

=7+3x5

=7+15=22

5/12x5+5/12x7用簡便方法計算

8樓:餹餹吢

把5/12提出來..

變成12分之5乘以(5+7)

變成12分之5乘以12

12和12約分就等於5

9樓:0困龍

=5/12 × 1/5 + 5/12 × 1/7=5/12×(1/5 + 1/7)

=5/12 × 12/35

=1/7

10樓:

原式=(12-7)/12*5+5/12*7=5-7/12*5+5/12*7=5

回答完畢...

11樓:想出走

5/12×5+5/12×7

=5/12×(5+7)=5

12樓:匿名使用者

5/12x(5+7)=5

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