去括号 (5a+b)+6a 5-(7-6m) (2x-7)-(4x-5) (3a方-3a-1)-(5a方+6a-8) (8mm-3m方)-5mm-2(3mn-2m方) 先化简再求值 3y方-x方+(x方-y)-(x方+3y方),x=1.y=-2
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![去括号 (5a+b)+6a 5-(7-6m) (2x-7)-(4x-5) (3a方-3a-1)-(5a方+6a-8) (8mm-3m方)-5mm-2(3mn-2m方) 先化简再求值 3y方-x方+(x方-y)-(x方+3y方),x=1.y=-2](/uploads/image/z/2002906-10-6.jpg?t=%E5%8E%BB%E6%8B%AC%E5%8F%B7+%285a%2Bb%29%2B6a+5-%287-6m%29+%282x-7%29-%284x-5%29+%283a%E6%96%B9-3a-1%29-%285a%E6%96%B9%2B6a-8%29+%288mm-3m%E6%96%B9%EF%BC%89-5mm-2%283mn-2m%E6%96%B9%29+%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC+3y%E6%96%B9-x%E6%96%B9%2B%28x%E6%96%B9-y%29-%28x%E6%96%B9%2B3y%E6%96%B9%EF%BC%89%2Cx%3D1.y%3D-2)
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