(x+y)(x-y)-(x的2次方-3xy),其中x等于2,y等于-2分之1
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(x+y)(x-y)-(x的2次方-3xy),其中x等于2,y等于-2分之1(x+y)(x-y)-(x的2次方-3xy),其中x等于2,y等于-2分之1(x+y)(x-y)-(x的2次方-3xy),其
(x+y)(x-y)-(x的2次方-3xy),其中x等于2,y等于-2分之1
(x+y)(x-y)-(x的2次方-3xy),其中x等于2,y等于-2分之1
(x+y)(x-y)-(x的2次方-3xy),其中x等于2,y等于-2分之1
(x+y)(x-y)-(x的2次方-3xy)
=x²-y²-x²+3xy
=3xy-y²
=3x2x(-1/2)-(-1/2)²
=-3-1/4
=-3.25
(x+y)(x-y)-(x的2次方-3xy)
=x^2-y^2-x^2+3xy
=3xy-y^2
代入x=2,y=-1/2
上式=-3-1/4= -13/4
(x+y)(x-y)-(x的2次方-3xy)
=X平方-Y平方-X平方+3XY
=-y平方+3XY
=-(-1/2)^2+3*2*(-1/2)
=-3.25
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