问题 解答题
8
3
5
-1.5÷[1
2
3
×(□+1
1
3
)]=8
2
5
,那么□中应填多少?
答案

8

3
5
-1.5÷[1
2
3
×(□+1
1
3
)]=8
2
5

8

3
5
-1.5÷[1
2
3
×(□+1
1
3
)]+1.5÷[1
2
3
×(□+1
1
3
)]=8
2
5
+1.5÷[1
2
3
×(□+1
1
3
)]

1.5÷[1

2
3
×(□+1
1
3
)]+8
2
5
=8
3
5

1.5÷[1

2
3
×(□+1
1
3
)]+8
2
5
-8
2
5
=8
3
5
-8
2
5

1.5÷[1

2
3
×(□+1
1
3
)]=
1
5

1.5÷[1

2
3
×(□+1
1
3
)]×[1
2
3
×(□+1
1
3
)]=
1
5
×[1
2
3
×(□+1
1
3
)]

1
5
×[1
2
3
×(□+1
1
3
)]÷
1
5
=1.5÷
1
5

1

2
3
×(□+1
1
3
)=7.5

1

2
3
×(□+1
1
3
)÷1
2
3
=7.5÷1
2
3

□+1

1
3
=4.5

□+1

1
3
-1
1
3
=4.5-1
1
3

□=3

1
6

所以,□中应填3

1
6

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