⑴﹣¼a²﹢3a﹣9⑵3x³-12x²y﹢12xy²
(1) 4x²-16 (2) xy-9x³y (3) 12abc-3bc² (4) a
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:⑴A-3B;⑵2A+B
x²+3y-xy-3x= x³-x²-x+= x²-1-2xy+y= a
x·(9x³y-3xy²)÷(﹣3x²y) 计算
已知2x²+xy=a,3y²-2xy=b,求4x²+8xy-9y²的值(用含a,
已知2x²+xy=a,3y²+2xy=b,求4x²+8xy+9y²的值(用a,b
8x³y-9xy³=x³y 3x³+2x²=5x^5 3a²
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
已知A=3x²-12,B=5x²y³+10xy³,C=(x+1)(x+3)+1,
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x