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Help me with some math problems! ! ! ! ! ! ! ! ! ! Speed! ! ! ! ! ! !
The decimal units of 1 and 5/6 are 6/617/912/71/7.

The unit of 65438+9 in 00 is 10, that of 65438 in 5+0 is 65438 in 20, and that of 65438 in 20 is 1.

2, the baby's sleep time every day accounts for about 5 of the whole day. 8. Is this wrong? Should it be five eighths?

Take (all day) as the unit "1", and divide it into (8) parts on average. Sleep time is like this (5).

3. 1 the number of students in the class is 2/9 of the class.

Take (class size) as the unit "1" and divide it into (9) copies on average. The number of excellent students is like this (2).

4, 10 storybook, distributed to five students on average. Each story book accounts for (65,438+0) of the total, and each story book accounts for (65,438+0) of the total.

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