无
*注意事项:
3.14×20= + = 0.5÷0.01= 0.32× =
21÷21%= × = 6-3 = ÷ =
①x:0.8=5:16
②15:x=8:
③3.5∶7=10∶x
④ =
⑤ : = :x
⑥(3.5-x):7=0.4:1.4
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