3x鲁-銆恱鲁+(6x虏-7y)+2(x虏-3x虏+4y)銆戝寲绠

longjiu0092022-10-04 11:39:541条回答

3x鲁-銆恱鲁+(6x虏-7y)+2(x虏-3x虏+4y)銆戝寲绠
3x³-[x³+(6x²-7y)+2(x²-3x²+4y)]化简,y=1

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tiger12244 共回答了17个问题 | 采纳率82.4%
3x³-[x³+(6x²-7y)+2(x²-3x²+4y)]
=3x³-(x³+6x²-7y+2x²-6x²+8y)
=3x³-(x³+2x²+y)
=3x³-x³-2x²-y
=2x³-2x²-y
1年前

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