6a+13a
= 19a
6x-28-2.5x+30.5
= 6x-2.5x-28+30.5
=3.5x+2.5
8a-(5a+8)
= 8a-5a-8
=3a-8
(5x+7)-(4x+0.18)
=5x+7-4x-0.18
=5x-4x+7-0.18
=x+6.82
呵呵.希望能够帮助到你.学业进步.
化简 6a+13a 6x-28-2.5x+30.5 8a-(5a+8) (5x+7)-(4x+0.18)
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