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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