计算:(-3x²y³)=_____ 计算:(9a²b-6ab²)÷(3ab)=______如果(-x+3)²=x²=ax+9 那么a=____
问题描述:
计算:(-3x²y³)=_____ 计算:(9a²b-6ab²)÷(3ab)=______
如果(-x+3)²=x²=ax+9 那么a=____
答
(-3x²y³)=-3x²y³(9a²b-6ab²)÷(3ab)=3a-2b如果(-x+3)²=x²=ax+9 则:x²-6x+9=x²6x=9x=3/2因:x²=ax+99/4=(3/2)a+99=6a+366a=27a=9/2