(10+a)x5.3/2-(10-a)x5.3/2=15.9怎么算
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![(10+a)x5.3/2-(10-a)x5.3/2=15.9怎么算](/uploads/image/z/3760118-62-8.jpg?t=%EF%BC%8810%2Ba%29x5.3%2F2-%EF%BC%8810-a%29x5.3%2F2%3D15.9%E6%80%8E%E4%B9%88%E7%AE%97)
(10+a)x5.3/2-(10-a)x5.3/2=15.9怎么算
(10+a)x5.3/2-(10-a)x5.3/2=15.9怎么算
(10+a)x5.3/2-(10-a)x5.3/2=15.9怎么算
(10+a)x5.3/2-(10-a)x5.3/2=15.9[(10+a)-(10-a)]x5.3/2=15.910+a-10+a=15.9÷5.3/22a=6a=6÷2a=3