230问答网 > 4⼀5+{1⼀5+3⼀4X4⼀7} 5⼀14*[6⼀7X{2⼀3+1⼀6}] 1⼀2-4X1⼀4*4 8⼀13*7+1⼀7X5⼀13 以上各题请帮忙解决怎样用简便就算

4⼀5+{1⼀5+3⼀4X4⼀7} 5⼀14[6⼀7X{2⼀3+1⼀6}] 1⼀2-4X1⼀44 8⼀13*7+1⼀7X5⼀13 以上各题请帮忙解决怎样用简便就算

2024-11-26 01:41:34

推荐回答（2个）

回答1：

4/5+{1/5+3/4X4/7}
=4/5+1/5+3/7
=1+3/7
=10/7

5/14÷[6/7X{2/3+1/6}]
=5/14÷(4/7+1/7)
=5/14÷5/7
=1/2

1/2-4X1/4÷4
=1/2-1/4
=1/4

8/13÷7+1/7X5/13
=8/13×1/7+1/7×5/13
=1/(13×7)×(8+5)
=1/(13×7)×13
=1/7

回答2：

4/5+{1/5+3/4X4/7}
=4/5+1/5+3/7
=1+3/7
=10/7
5/14*[6/7X{2/3+1/6}]
=5/14*(4/7+1/7)
=5/14*5/7
=25/98
1/2-4X1/4*4
=1/2-1/4
=1/4
8/13*7+1/7X5/13
=8/91+5/91
=13/91
=1/7