
3个回答
展开全部
9×9/13+9/13÷9
=9×9/13+9/13×1/9
=9×1/9+9/13×9/13×1
=1+9/13×(9+1)
=1+9/13×9+9/13×1
=(1+9×9)×1/13
=82/13
=9×9/13+9/13×1/9
=9×1/9+9/13×9/13×1
=1+9/13×(9+1)
=1+9/13×9+9/13×1
=(1+9×9)×1/13
=82/13
展开全部
(9*9/13+9/13)*9==10*9/13*9=810/13
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