请化简(5x+2y-3)-(x-7y+9)立即采纳!
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请化简(5x+2y-3)-(x-7y+9)立即采纳!请化简(5x+2y-3)-(x-7y+9)立即采纳!请化简(5x+2y-3)-(x-7y+9)立即采纳!(5x+2y-3)-(x-7y+9)=5x+
请化简(5x+2y-3)-(x-7y+9)立即采纳!
请化简(5x+2y-3)-(x-7y+9)立即采纳!
请化简(5x+2y-3)-(x-7y+9)立即采纳!
(5x+2y-3)-(x-7y+9)
=5x+2y-3-x+7y-9
=4x+9y-12
原式=5x+2y-3-x+7y-9=4x+9y-12
(5x+2y-3)-(x-7y+9)
=(5x+2y-3)-x+7y-9 .............(去括号)
=5x+2y-3-x+7y-9 .............(去括号)
=4x+9y-12 .................(合并同类项)
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