计算(1)(5ab-3xy)(-3xy-5ab)(2)(-2a²+56³)²(3)x(9x-5)-(3x+1)(3x-1)(4)(a-2b+1)²
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计算:3xy-4xy-(-2xy)3xy-4xy-(-2xy)-1/3ab-1/4a²+1/3a²-(-2/3ab)
计算:3xy-4xy-(-2xy)要过程
计算:(xy)^5÷(xy)^3÷(-xy)
计算(-1/2xy²)²(3xy-4xy²+1)
计算(3x^2y-xy^2+1/2xy)/(-1/2xy)
计算(-3分之1xy²)²×[xy(2x-y)+xy²]=
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)
计算(xy)^5/(xy)^3/(-xy)要过程!
(1)3xy-4xy-(-2xy)
计算;(-2xy)(3xy²)=( )
计算:3xy[2xy-x(y-2)+x]
计算 (-ab-xy)(ab+xy)
已知(x+1)*(x+1)=-Iy-1I,求2(xy-(5xy)*(5xy))-3((xy)*(xy)-xy)
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)²
5xy^2-{2x^y-[3xy^2-(xy^2-2x^2y)]/(-1/2xy)}
计算:(1)(7-3x)+(5x-6) (2)-(x^2-3)-(7-5x^2) (3)xy-(3x-2xy)+(3xy-2x)