无
*注意事项:
÷5= =0.4= =
3+2÷9= - = - = + =
4 - = +1.75= +1.2= + - + =
① -( + )
②2 +0.125+
③20- -3.25
④ + +5 +
⑤ + -
⑥ + -
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