无
*注意事项:
+ = - = + = - =
1- = + = + = - =
①x- =
②x÷0.3=0.3
③3. 6x+1=2.8
④3.2 x+x=8.4
⑤18x-0.8=3.7
⑥4x+0.5×2.4=6
18=++ 42=××
20÷12= =
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