9n^2-9n+2=(3n-1)(3n-2),最后的结果怎么算的?
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9n^2-9n+2=(3n-1)(3n-2),最后的结果怎么算的?
9n^2-9n+2=(3n-1)(3n-2),最后的结果怎么算的?
9n^2-9n+2=(3n-1)(3n-2),最后的结果怎么算的?
十字相乘法,具体你去问老师比较好,多练练,这些一眼能看出来。
9n^2-9n+2=(3n×3n)-3n×2-1×3n+1×2=9n^2-6n-3n+2= 9n^2-9n+2