4/5X(-5/13)-(-3/5)X-5/13X(-3/15)等于多少
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4/5X(-5/13)-(-3/5)X-5/13X(-3/15)等于多少
![4/5X(-5/13)-(-3/5)X-5/13X(-3/15)等于多少](/uploads/image/z/6860631-39-1.jpg?t=4%2F5X%28-5%2F13%29-%28-3%2F5%29X-5%2F13X%28-3%2F15%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
=(-4/13)X+(3/5)X+(1/13)X
=(-20/65)X+(39/65)X+(5/65)X
=(24/65)X
=8/15X
=(-20/65)X+(39/65)X+(5/65)X
=(24/65)X
=8/15X
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