2.当x=三分之二,y=四分之三,e=—2又二分之一时,分别求出下列代数各值.(1)-x+g+e (2)-x-y-(-e)3.若/a/=21 /b/=27,且/a+b/=-(a+b),求a-b的值
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![2.当x=三分之二,y=四分之三,e=—2又二分之一时,分别求出下列代数各值.(1)-x+g+e (2)-x-y-(-e)3.若/a/=21 /b/=27,且/a+b/=-(a+b),求a-b的值](/uploads/image/z/11519972-44-2.jpg?t=2.%E5%BD%93x%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C%2Cy%3D%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%89%2Ce%3D%E2%80%942%E5%8F%88%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%E6%97%B6%2C%E5%88%86%E5%88%AB%E6%B1%82%E5%87%BA%E4%B8%8B%E5%88%97%E4%BB%A3%E6%95%B0%E5%90%84%E5%80%BC.%EF%BC%881%EF%BC%89-x%2Bg%2Be+%282%29-x-y-%28-e%293.%E8%8B%A5%2Fa%2F%3D21+%2Fb%2F%3D27%2C%E4%B8%94%2Fa%2Bb%2F%3D-%28a%2Bb%29%2C%E6%B1%82a-b%E7%9A%84%E5%80%BC)
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