A=3/10÷(4/5-7/2)
=3/10÷(8/10-35/10)
=3/10÷(-27/10)
=3/10×(-10/27)
=30/270
=1/9
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A=3/10÷(4/5-7/2)
=3/10÷(8/10-35/10)
=3/10÷(-27/10)
=3/10×(-10/27)
=30/270
=1/9