化简(3X²-XY+Y²)-5(X²-XY+2Y²)化简一.(3X²-XY+Y²)-5(X²-XY+2Y²)二.2(a²b-3)-5(a²b+6)先化简,在求值2a²-b²+(2b²-a²)-(a²-2b²)其中a=三分
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化简(3X²-XY+Y²)-5(X²-XY+2Y²)化简一.(3X²-XY+Y²)-5(X²-XY+2Y²)二.2(a²b-3)-5(a²b+6)先化简,在求值2a²-b²+(2b²-a²)-(a²-2b²)其中a=三分
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
化简
一.(3X²-XY+Y²)-5(X²-XY+2Y²)
二.2(a²b-3)-5(a²b+6)
先化简,在求值
2a²-b²+(2b²-a²)-(a²-2b²)其中a=三分之一 b=3
2X³[x³+(6X²-7X)-2(X³-3X²-4X)其中X=-1
化简(3X²-XY+Y²)-5(X²-XY+2Y²)化简一.(3X²-XY+Y²)-5(X²-XY+2Y²)二.2(a²b-3)-5(a²b+6)先化简,在求值2a²-b²+(2b²-a²)-(a²-2b²)其中a=三分
原式=3X²-XY+Y²-5X²+5XY-10Y²
=-2X²+4XY-9Y²
原式=2a²b-6-5a²b-30
=-3a²b-36
原式=2a²-b²+2b²-a²-a²+2b²
=3b²
=3×3²
=27
原式=2x³+x³+6x²-7x-2x³+6x²+8x
=x³+12x²+x
=(-1)³+12×(-1)²+(-1)
=10