当(a+2b/2a—3b)=3时,求代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值
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当(a+2b/2a—3b)=3时,求代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值
![当(a+2b/2a—3b)=3时,求代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值](/uploads/image/z/284947-43-7.jpg?t=%E5%BD%93%EF%BC%88a%2B2b%2F2a%E2%80%943b%EF%BC%89%3D3%E6%97%B6%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%884b%2B2a%2F9b%E2%80%946a%EF%BC%89%E2%80%94%EF%BC%884a%E2%80%946b%2F3a%2B6b%EF%BC%89%E7%9A%84%E5%80%BC)
(a+2b/2a—3b)=3时
(2a—3b/a+2b)=1/3
代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值
=-2/3(a+2b/2a-3b)—2/3(2a—3b/a+2b)
=-2/3*3 -2/3 *(1/3)
=-2-2/9
=-20/9
再问: 请解释一下谢谢
再答: 代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值 =-2/3(a+2b/2a-3b)—2/3(2a—3b/a+2b)(提取公因数,把原式化成与(a+2b/2a—3b)=3) =-2/3*3 -2/3 *(1/3) =-2-2/9 =-20/9
(2a—3b/a+2b)=1/3
代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值
=-2/3(a+2b/2a-3b)—2/3(2a—3b/a+2b)
=-2/3*3 -2/3 *(1/3)
=-2-2/9
=-20/9
再问: 请解释一下谢谢
再答: 代数式(4b+2a/9b—6a)—(4a—6b/3a+6b)的值 =-2/3(a+2b/2a-3b)—2/3(2a—3b/a+2b)(提取公因数,把原式化成与(a+2b/2a—3b)=3) =-2/3*3 -2/3 *(1/3) =-2-2/9 =-20/9
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