计算:1.{2x(x²y+xy²)-4xy(xy-x²)}÷(-2x²y)2.先化简,在求值,其中x=-1/3:(3x+2)(3x-2)-5x(x-1)-(2x-1)² ------------------要过程
问题描述:
计算:1.{2x(x²y+xy²)-4xy(xy-x²)}÷(-2x²y)
2.先化简,在求值,其中x=-1/3:(3x+2)(3x-2)-5x(x-1)-(2x-1)² ------------------要过程
答
1:2x³y+2x²y²-4x²y²+4x³y÷(-2x²y)=6x³y-2x²y²÷(-2x²y)=y-3x
2:由原式得9x²-4-5x²+5x-2x+1=4x²+3x-3=-32/9