Simple calculation of 9 out of 17 divided by 7 + 1 out of 7 * 8 out of 17

9/17÷7+1/7×8/17
=9/17×1/7+1/7×8/17
=1/7×9/17+1/7×8/17
=1/7×（9/17+8/17）
=1/7×1
=1/7

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