20/37X9/29+9/37X17/29=?简算
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20/37X9/29+9/37X17/29=?简算
20/37X9/29+9/37X17/29
=20/37X9/29+17/37X9/29
=(20/37+17/37)X9/29
=1X9/29
=9/29
20/37X9/29+9/37X17/29=?简算
20/37X9/29+9/37X17/29
=20/37X9/29+17/37X9/29
=(20/37+17/37)X9/29
=1X9/29
=9/29