(2xy-3)(2xy+3)+(xy+3)^2化简求值 x=1/5 y=-2

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(2xy-3)(2xy+3)+(xy+3)^2化简求值x=1/5y=-2(2xy-3)(2xy+3)+(xy+3)^2化简求值x=1/5y=-2(2xy-3)(2xy+3)+(xy+3)^2化简求值x

(2xy-3)(2xy+3)+(xy+3)^2化简求值 x=1/5 y=-2
(2xy-3)(2xy+3)+(xy+3)^2化简求值 x=1/5 y=-2

(2xy-3)(2xy+3)+(xy+3)^2化简求值 x=1/5 y=-2
x=1/5 , y=-2
xy=-2/5

(2xy-3)(2xy+3)+(xy+3)^2
=(2xy)²-9+(xy)²+6xy+9
=5(xy)²+6xy
=xy(5xy+6)
=(-2/5)[5(-2/5)+6]
=(-2/5)[-2+6]
=(-2/5)[4]
=-8/5

(-3xy+2xy)-(4xy+xy) 3xy-3xy-xy+2yx 3xy-4xy-（-2xy） 3xy-4xy-（-2xy） 2xy.(-3xy)÷(xy) 2xy-xy-(-3xy)= [(2xy-3)(2xy+3)+(xy+3)^2]/(-xy) xy－3xy＋2xy－xy 3xy^2*(-2xy) xy×(xy)²-3xy 3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x) 3(xy－xy)－2(xy＋xy)＋3xy (-4xy^3)×（-xy）+（-3xy^2）^2 （-3xy^2)^2+(-4xy^3)*(-xy)=多少 (-4xy^3)*(-xy)+(-3xy^2)^2 (3xy^2)^2+(-xy^3)(4xy) 1/2xy(2/3xy²-2xy) 3(xy-z)^2-(2xy+z)(-z+2xy)