(51/2+18/5)*9*17简算

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(51/2+18/渗局5)*9*17
=51/嫌升2*9*17+18/5*9*17
=6+2/丛者让85
=2/99

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(51/态局碧2+18/5)*9*17
=51/腊扮2*9*17+18/5*9*17
=3/帆举2*9+10*17
=6+170
=176

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