计算:(x²-y²)-4(2x²-3y²)
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计算:(x²-y²)-4(2x²-3y²)计算:(x²-y²)-4(2x²-3y²)计算:(x²-y²
计算:(x²-y²)-4(2x²-3y²)
计算:(x²-y²)-4(2x²-3y²)
计算:(x²-y²)-4(2x²-3y²)
=x²-y²-8x²+12y²
=(1-8)x²+(-1+12)y²
=-7x²+11y²
-7x²+11y²