5x³-[3x²-(x-1)]去括号______
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5x³-[3x²-(x-1)]去括号______5x³-[3x²-(x-1)]去括号______5x³-[3x²-(x-1)]去括号____
5x³-[3x²-(x-1)]去括号______
5x³-[3x²-(x-1)]去括号______
5x³-[3x²-(x-1)]去括号______
5x³-[3x²-(x-1)] 从内到外
=5x³-(3x²-x+1)
=5x³-3x²+x-1
5x³-[3x²-(x-1)] 从外到内
=5x³-3x²+(x-1)
=5x³-3x²+x-1
2x的立方+x-1