无
*注意事项:
= = =÷
2 5.6
1- = - = + = - = + =
- = + = 2+ = - = + =
① + +
② - +
③ + + +
④ -( + )
⑤ - -
⑥ +( - )
男生人数占全班人数的几分之几?
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