若(x-3y)2=(x+3y)2+M,则M=________.
分解因式:a3-10a2+25a=________.
计算(x+1)(2x-3)的结果为________.
计算x·2x2的结果是________.
若x-y+3=0,则x(x-4y)+y(2x+y)的值为( )
A. 9 B. -9 C. 3 D. -3
已知实数a、b满足a+b=2,ab=,则a﹣b=( )
A. 1 B. ﹣ C. ±1 D. ±